diff --git a/app/assets/javascripts/editor/editor.js.erb b/app/assets/javascripts/editor/editor.js.erb
index 4e26723a..c4cb46f9 100644
--- a/app/assets/javascripts/editor/editor.js.erb
+++ b/app/assets/javascripts/editor/editor.js.erb
@@ -436,7 +436,6 @@ configureEditors: function () {
       url: $('#editor').data('errors-url')
     });
     jqxhr.always(this.hideSpinner);
-    jqxhr.done(this.renderHint);
   },
 
   toggleButtonStates: function () {
@@ -482,7 +481,6 @@ configureEditors: function () {
 
   resetOutputTab: function () {
     this.clearOutput();
-    $('#hint').fadeOut();
     $('#flowrHint').fadeOut();
     this.clearHints();
     this.showOutputBar();
diff --git a/app/assets/javascripts/editor/evaluation.js b/app/assets/javascripts/editor/evaluation.js
index 79bd52a8..5e631b2b 100644
--- a/app/assets/javascripts/editor/evaluation.js
+++ b/app/assets/javascripts/editor/evaluation.js
@@ -57,14 +57,6 @@ CodeOceanEditorEvaluation = {
     }
   },
 
-  renderHint: function (object) {
-    var hint = object.data || object.hint;
-    if (hint) {
-      $('#hint .card-body').text(hint);
-      $('#hint').fadeIn();
-    }
-  },
-
   renderScore: function () {
     var score = parseFloat($('#score').data('score'));
     var maximum_score = parseFloat($('#score').data('maximum-score'));
diff --git a/app/assets/stylesheets/editor.css.scss b/app/assets/stylesheets/editor.css.scss
index dff00f6f..63888039 100644
--- a/app/assets/stylesheets/editor.css.scss
+++ b/app/assets/stylesheets/editor.css.scss
@@ -64,10 +64,6 @@ button i.fa-spin {
   overflow: auto;
 }
 
-#hint {
-  display: none;
-}
-
 #outputInformation {
   #output {
     max-height: 500px;
diff --git a/app/controllers/code_ocean/errors_controller.rb b/app/controllers/code_ocean/errors_controller.rb
deleted file mode 100644
index 6b594dae..00000000
--- a/app/controllers/code_ocean/errors_controller.rb
+++ /dev/null
@@ -1,45 +0,0 @@
-module CodeOcean
-  class ErrorsController < ApplicationController
-    before_action :set_execution_environment
-
-    def authorize!
-      authorize(@error || @errors)
-    end
-    private :authorize!
-
-    def create
-      @error = CodeOcean::Error.new(error_params)
-      authorize!
-      hint = Whistleblower.new(execution_environment: @error.execution_environment).generate_hint(@error.message)
-      respond_to do |format|
-        format.json do
-          if hint
-            render(json: {hint: hint})
-          else
-            head (@error.save ? :created : :unprocessable_entity)
-          end
-        end
-      end
-    end
-
-    def error_params
-      params[:error].permit(:message, :submission_id).merge(execution_environment_id: @execution_environment.id) if params[:error].present?
-    end
-    private :error_params
-
-    def index
-      @errors = CodeOcean::Error.for_execution_environment(@execution_environment).grouped_by_message.paginate(page: params[:page])
-      authorize!
-    end
-
-    def set_execution_environment
-      @execution_environment = ExecutionEnvironment.find(params[:execution_environment_id])
-    end
-    private :set_execution_environment
-
-    def show
-      @error = CodeOcean::Error.find(params[:id])
-      authorize!
-    end
-  end
-end
\ No newline at end of file
diff --git a/app/controllers/hints_controller.rb b/app/controllers/hints_controller.rb
deleted file mode 100644
index 48b86b63..00000000
--- a/app/controllers/hints_controller.rb
+++ /dev/null
@@ -1,57 +0,0 @@
-class HintsController < ApplicationController
-  include CommonBehavior
-
-  before_action :set_execution_environment
-  before_action :set_hint, only: MEMBER_ACTIONS
-
-  def authorize!
-    authorize(@hint || @hints)
-  end
-  private :authorize!
-
-  def create
-    @hint = Hint.new(hint_params)
-    authorize!
-    create_and_respond(object: @hint, path: proc { execution_environment_hint_path(@execution_environment, @hint) })
-  end
-
-  def destroy
-    destroy_and_respond(object: @hint, path: execution_environment_hints_path(@execution_environment))
-  end
-
-  def edit
-  end
-
-  def hint_params
-    params[:hint].permit(:locale, :message, :name, :regular_expression).merge(execution_environment_id: @execution_environment.id) if params[:hint].present?
-  end
-  private :hint_params
-
-  def index
-    @hints = @execution_environment.hints.order(:name).paginate(page: params[:page])
-    authorize!
-  end
-
-  def new
-    @hint = Hint.new
-    authorize!
-  end
-
-  def set_execution_environment
-    @execution_environment = ExecutionEnvironment.find(params[:execution_environment_id])
-  end
-  private :set_execution_environment
-
-  def set_hint
-    @hint = Hint.find(params[:id])
-    authorize!
-  end
-  private :set_hint
-
-  def show
-  end
-
-  def update
-    update_and_respond(object: @hint, params: hint_params, path: execution_environment_hint_path(@execution_environment, @hint))
-  end
-end
diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
index 32d1e560..039efa02 100644
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -126,14 +126,6 @@ class SubmissionsController < ApplicationController
 
     #   server_sent_event.write({stdout: output[:stdout]}, event: 'output') if output[:stdout]
     #   server_sent_event.write({stderr: output[:stderr]}, event: 'output') if output[:stderr]
-
-    #   unless output[:stderr].nil?
-    #     if hint = Whistleblower.new(execution_environment: @submission.execution_environment).generate_hint(output[:stderr])
-    #       server_sent_event.write(hint, event: 'hint')
-    #     else
-    #       store_error(output[:stderr])
-    #     end
-    #   end
     # end
 
     hijack do |tubesock|
@@ -365,11 +357,6 @@ class SubmissionsController < ApplicationController
     head :ok
   end
 
-  def store_error(stderr)
-    CodeOcean::Error.create(submission_id: @submission.id, execution_environment_id: @submission.execution_environment.id, message: stderr)
-  end
-  private :store_error
-
   def test
     hijack do |tubesock|
       Thread.new { EventMachine.run } unless EventMachine.reactor_running? && EventMachine.reactor_thread.alive?
diff --git a/app/models/code_ocean/error.rb b/app/models/code_ocean/error.rb
deleted file mode 100644
index 935962cf..00000000
--- a/app/models/code_ocean/error.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-module CodeOcean
-  class Error < ApplicationRecord
-    belongs_to :execution_environment
-
-    scope :for_execution_environment, ->(execution_environment) { where(execution_environment_id: execution_environment.id) }
-    scope :grouped_by_message, -> { select('MAX(created_at) AS created_at, MAX(id) AS id, message, COUNT(id) AS count').group(:message).order('count DESC') }
-
-    validates :execution_environment_id, presence: true
-    validates :message, presence: true
-
-    def self.nested_resource?
-      true
-    end
-
-    def to_s
-      id.to_s
-    end
-  end
-end
diff --git a/app/models/execution_environment.rb b/app/models/execution_environment.rb
index 613fb082..33d57868 100644
--- a/app/models/execution_environment.rb
+++ b/app/models/execution_environment.rb
@@ -10,7 +10,6 @@ class ExecutionEnvironment < ApplicationRecord
 
   has_many :exercises
   belongs_to :file_type
-  has_many :hints
   has_many :error_templates
 
   scope :with_exercises, -> { where('id IN (SELECT execution_environment_id FROM exercises)') }
diff --git a/app/models/hint.rb b/app/models/hint.rb
deleted file mode 100644
index b54ba8a2..00000000
--- a/app/models/hint.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-class Hint < ApplicationRecord
-  belongs_to :execution_environment
-
-  validates :execution_environment_id, presence: true
-  validates :locale, presence: true
-  validates :message, presence: true
-  validates :name, presence: true
-  validates :regular_expression, presence: true
-
-  def self.nested_resource?
-    true
-  end
-
-  def to_s
-    name
-  end
-end
diff --git a/app/policies/code_ocean/error_policy.rb b/app/policies/code_ocean/error_policy.rb
deleted file mode 100644
index 376af8d8..00000000
--- a/app/policies/code_ocean/error_policy.rb
+++ /dev/null
@@ -1,7 +0,0 @@
-module CodeOcean
-  class ErrorPolicy < AdminOrAuthorPolicy
-    def author?
-      @user == @record.execution_environment.author
-    end
-  end
-end
diff --git a/app/policies/hint_policy.rb b/app/policies/hint_policy.rb
deleted file mode 100644
index 4c0a08fd..00000000
--- a/app/policies/hint_policy.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-class HintPolicy < AdminOrAuthorPolicy
-  def author?
-    @user == @record.execution_environment.author
-  end
-end
diff --git a/app/views/code_ocean/errors/index.html.slim b/app/views/code_ocean/errors/index.html.slim
deleted file mode 100644
index dbfa2312..00000000
--- a/app/views/code_ocean/errors/index.html.slim
+++ /dev/null
@@ -1,19 +0,0 @@
-h1 = CodeOcean::Error.model_name.human(count: 2)
-
-.table-responsive
-  table.table
-    thead
-      tr
-        th = t('errors.index.count')
-        th = t('activerecord.attributes.error.message')
-        th = t('shared.created_at')
-        th = t('shared.actions')
-    tbody
-      - @errors.each do |error|
-        tr
-          td = error.count
-          td = error.message
-          td = l(error.created_at, format: :short)
-          td = link_to(t('shared.show'), execution_environment_error_path(params[:execution_environment_id], error))
-
-p = render('shared/pagination', collection: @errors)
diff --git a/app/views/code_ocean/errors/show.html.slim b/app/views/code_ocean/errors/show.html.slim
deleted file mode 100644
index 1bb6623e..00000000
--- a/app/views/code_ocean/errors/show.html.slim
+++ /dev/null
@@ -1,4 +0,0 @@
-h1 = CodeOcean::Error.model_name.human
-
-= row(label: 'error.message', value: @error.message)
-= row(label: 'shared.created_at', value: l(@error.created_at, format: :short))
diff --git a/app/views/execution_environments/index.html.slim b/app/views/execution_environments/index.html.slim
index 20e99620..a749df7c 100644
--- a/app/views/execution_environments/index.html.slim
+++ b/app/views/execution_environments/index.html.slim
@@ -11,7 +11,6 @@ h1 = ExecutionEnvironment.model_name.human(count: 2)
         th = t('activerecord.attributes.execution_environment.network_enabled')
         th = t('activerecord.attributes.execution_environment.permitted_execution_time')
         th colspan=5 = t('shared.actions')
-        th colspan=2 = t('shared.resources')
     tbody
       - @execution_environments.each do |execution_environment|
         tr
@@ -26,8 +25,6 @@ h1 = ExecutionEnvironment.model_name.human(count: 2)
           td = link_to(t('shared.destroy'), execution_environment, data: {confirm: t('shared.confirm_destroy')}, method: :delete)
           td = link_to(t('.shell'), shell_execution_environment_path(execution_environment))
           td = link_to(t('shared.statistics'), statistics_execution_environment_path(execution_environment))
-          td = link_to(t('activerecord.models.error.other'), execution_environment_errors_path(execution_environment.id))
-          td = link_to(t('activerecord.models.hint.other'), execution_environment_hints_path(execution_environment.id))
 
 = render('shared/pagination', collection: @execution_environments)
 p = render('shared/new_button', model: ExecutionEnvironment)
diff --git a/app/views/exercises/_editor.html.slim b/app/views/exercises/_editor.html.slim
index 44fc0aec..700a9855 100644
--- a/app/views/exercises/_editor.html.slim
+++ b/app/views/exercises/_editor.html.slim
@@ -4,7 +4,7 @@
 - show_break_interventions = @show_break_interventions || "false"
 - show_rfc_interventions = @show_rfc_interventions || "false"
 - hide_rfc_button = @hide_rfc_button || false
-#editor.row data-exercise-id=@exercise.id data-message-depleted=t('exercises.editor.depleted') data-message-timeout=t('exercises.editor.timeout',  permitted_execution_time: @exercise.execution_environment.permitted_execution_time) data-errors-url=execution_environment_errors_path(exercise.execution_environment) data-submissions-url=submissions_path data-user-id=@current_user.id data-user-external-id=external_user_external_id data-working-times-url=working_times_exercise_path(@exercise) data-intervention-save-url=intervention_exercise_path(@exercise) data-rfc-interventions=show_rfc_interventions data-break-interventions=show_break_interventions data-course_token=@course_token data-search-save-url=search_exercise_path(@exercise)
+#editor.row data-exercise-id=@exercise.id data-message-depleted=t('exercises.editor.depleted') data-message-timeout=t('exercises.editor.timeout',  permitted_execution_time: @exercise.execution_environment.permitted_execution_time) data-submissions-url=submissions_path data-user-id=@current_user.id data-user-external-id=external_user_external_id data-working-times-url=working_times_exercise_path(@exercise) data-intervention-save-url=intervention_exercise_path(@exercise) data-rfc-interventions=show_rfc_interventions data-break-interventions=show_break_interventions data-course_token=@course_token data-search-save-url=search_exercise_path(@exercise)
   div id="sidebar" class=(@exercise.hide_file_tree ? 'sidebar-col-collapsed' : 'sidebar-col') = render('editor_file_tree', exercise: @exercise, files: @files)
   div.editor-col.col.p-0 id='frames'
     #editor-buttons.btn-group.enforce-bottom-margin
diff --git a/app/views/exercises/_editor_output.html.slim b/app/views/exercises/_editor_output.html.slim
index 133b558e..dd6849da 100644
--- a/app/views/exercises/_editor_output.html.slim
+++ b/app/views/exercises/_editor_output.html.slim
@@ -37,11 +37,6 @@ div.h-100 id='output_sidebar_uncollapsed' class='d-none col-sm-12 enforce-bottom
       div.enforce-big-top-margin
         #turtlediv
           canvas#turtlecanvas.d-none width=400 height=400
-      div.enforce-big-top-margin
-        #hint
-          .card.bg-warning.text-white
-            .card-header = t('exercises.implement.hint')
-            .card-body
       div.enforce-big-top-margin
         #prompt.input-group.d-none
           div.input-group-prepend
diff --git a/app/views/hints/_form.html.slim b/app/views/hints/_form.html.slim
deleted file mode 100644
index 21ab6bc1..00000000
--- a/app/views/hints/_form.html.slim
+++ /dev/null
@@ -1,17 +0,0 @@
-= form_for(@hint, url: execution_environment_hints_path(params[:execution_environment_id])) do |f|
-  = render('shared/form_errors', object: @hint)
-  .form-group
-    = f.label(:name)
-    = f.text_field(:name, class: 'form-control', required: true)
-  .form-group
-    = f.label(:locale)
-    = f.select(:locale, I18n.available_locales.map { |locale| [t("locales.#{locale}"), locale] }, {}, class: 'form-control')
-  .form-group
-    = f.label(:message)
-    = f.text_field(:message, class: 'form-control', placeholder: "'$2' has no method '$1'.", required: true)
-    .help-block.form-text = t('.hints.message')
-  .form-group
-    = f.label(:regular_expression)
-    = f.text_field(:regular_expression, class: 'form-control', placeholder: 'undefined method (\w+) for (\w+)', required: true)
-    .help-block.form-text = t('.hints.regular_expression')
-  .actions = render('shared/submit_button', f: f, object: @hint)
diff --git a/app/views/hints/edit.html.slim b/app/views/hints/edit.html.slim
deleted file mode 100644
index 0c1f4dac..00000000
--- a/app/views/hints/edit.html.slim
+++ /dev/null
@@ -1,3 +0,0 @@
-h1 = @hint
-
-= render('form')
diff --git a/app/views/hints/index.html.slim b/app/views/hints/index.html.slim
deleted file mode 100644
index 6a80bbdb..00000000
--- a/app/views/hints/index.html.slim
+++ /dev/null
@@ -1,20 +0,0 @@
-h1 = Hint.model_name.human(count: 2)
-
-.table-responsive
-  table.table
-    thead
-      tr
-        th = t('activerecord.attributes.hint.name')
-        th = t('activerecord.attributes.hint.locale')
-        th colspan=3 = t('shared.actions')
-    tbody
-      - @hints.each do |hint|
-        tr
-          td = hint.name
-          td = t("locales.#{hint.locale}")
-          td = link_to(t('shared.show'), execution_environment_hint_path(params[:execution_environment_id], hint.id))
-          td = link_to(t('shared.edit'), edit_execution_environment_hint_path(params[:execution_environment_id], hint.id))
-          td = link_to(t('shared.destroy'), execution_environment_hint_path(params[:execution_environment_id], hint.id), data: {confirm: t('shared.confirm_destroy')}, method: :delete)
-
-= render('shared/pagination', collection: @hints)
-p = render('shared/new_button', model: Hint, path: new_execution_environment_hint_path(params[:execution_environment_id]))
diff --git a/app/views/hints/new.html.slim b/app/views/hints/new.html.slim
deleted file mode 100644
index a933bede..00000000
--- a/app/views/hints/new.html.slim
+++ /dev/null
@@ -1,3 +0,0 @@
-h1 = t('shared.new_model', model: Hint.model_name.human)
-
-= render('form')
diff --git a/app/views/hints/show.html.slim b/app/views/hints/show.html.slim
deleted file mode 100644
index 6db995f5..00000000
--- a/app/views/hints/show.html.slim
+++ /dev/null
@@ -1,8 +0,0 @@
-h1
-  = @hint
-  = render('shared/edit_button', object: @hint, path: edit_execution_environment_hint_path(params[:execution_environment_id], @hint.id))
-
-= row(label: 'hint.name', value: @hint.name)
-= row(label: 'hint.locale', value: t("locales.#{@hint.locale}"))
-= row(label: 'hint.message', value: @hint.message)
-= row(label: 'hint.regular_expression', value: code_tag(@hint.regular_expression))
diff --git a/app/views/tags/index.html.slim b/app/views/tags/index.html.slim
index 2d4916af..449a1165 100644
--- a/app/views/tags/index.html.slim
+++ b/app/views/tags/index.html.slim
@@ -5,8 +5,7 @@ h1 = Tag.model_name.human(count: 2)
     thead
       tr
         th = t('activerecord.attributes.hint.name')
-        /th = t('activerecord.attributes.hint.locale')
-        /th colspan=3 = t('shared.actions')
+        th colspan=3 = t('shared.actions')
     tbody
       - @tags.each do |tag|
         tr
diff --git a/config/locales/de.yml b/config/locales/de.yml
index fdaa2a18..4cbd120c 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -7,8 +7,6 @@ de:
         name: Name
         oauth_key: OAuth Key
         oauth_secret: OAuth Secret
-      error:
-        message: Nachricht
       execution_environment:
         docker_image: Docker-Image
         exposed_ports: Zugängliche Ports
@@ -140,9 +138,6 @@ de:
       consumer:
         one: Konsument
         other: Konsumenten
-      error:
-        one: Fehler
-        other: Fehler
       error_template:
         one: Fehlertemplate
         other: Fehlertemplates
@@ -229,10 +224,6 @@ de:
   consumers:
     show:
       link: Konsument
-  errors:
-    connection_refused: Verbindung abgelehnt
-    index:
-      count: Anzahl
   execution_environments:
     form:
       hints:
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 5073d525..40922a02 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -7,8 +7,6 @@ en:
         name: Name
         oauth_key: OAuth Key
         oauth_secret: OAuth Secret
-      error:
-        message: Message
       execution_environment:
         docker_image: Docker Image
         exposed_ports: Exposed Ports
@@ -140,9 +138,6 @@ en:
       consumer:
         one: Consumer
         other: Consumers
-      error:
-        one: Error
-        other: Errors
       error_template:
         one: Error Template
         other: Error Templates
@@ -229,10 +224,6 @@ en:
   consumers:
     show:
       link: Consumer
-  errors:
-    connection_refused: Connection refused
-    index:
-      count: Count
   execution_environments:
     form:
       hints:
diff --git a/config/routes.rb b/config/routes.rb
index c146a69b..4b1a4719 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -64,9 +64,6 @@ Rails.application.routes.draw do
       post 'shell', as: :execute_command, action: :execute_command
       get :statistics
     end
-
-    resources :errors, only: [:create, :index, :show], controller: 'code_ocean/errors'
-    resources :hints
   end
 
   post '/import_proforma_xml' => 'exercises#import_proforma_xml'
diff --git a/db/migrate/20181127160857_drop_hints.rb b/db/migrate/20181127160857_drop_hints.rb
new file mode 100644
index 00000000..83f0905e
--- /dev/null
+++ b/db/migrate/20181127160857_drop_hints.rb
@@ -0,0 +1,5 @@
+class DropHints < ActiveRecord::Migration[5.2]
+  def change
+    drop_table :hints
+  end
+end
diff --git a/db/migrate/20181129093207_drop_errors.rb b/db/migrate/20181129093207_drop_errors.rb
new file mode 100644
index 00000000..fde39f6d
--- /dev/null
+++ b/db/migrate/20181129093207_drop_errors.rb
@@ -0,0 +1,46 @@
+class DropErrors < ActiveRecord::Migration[5.2]
+
+  # define old CodeOcean::Error module so that the migration works
+  module CodeOcean
+    class Error < ApplicationRecord
+      belongs_to :execution_environment
+
+      scope :for_execution_environment, ->(execution_environment) { where(execution_environment_id: execution_environment.id) }
+      scope :grouped_by_message, -> { select('MAX(created_at) AS created_at, MAX(id) AS id, message, COUNT(id) AS count').group(:message).order('count DESC') }
+
+      validates :execution_environment_id, presence: true
+      validates :message, presence: true
+
+      def self.nested_resource?
+        true
+      end
+
+      def to_s
+        id.to_s
+      end
+    end
+  end
+
+
+
+  def change
+
+    puts 'Migrating CodeOcean::Errors to StructuredErrors using RegEx. This might take a (long) while but will return.'
+    submissions_controller = SubmissionsController.new
+
+    # Iterate only over those Errors containing a message and submission_id
+    CodeOcean::Error.where.not(message: [nil, ""]).where.not(submission_id: [nil, ""]).each do |error|
+      raw_output = error.message
+      submission = Submission.find_by(id: error.submission_id)
+
+      # Validate that we have everything we need: the output, the submission and the execution environment
+      next if submission.exercise.execution_environment.blank?
+
+      submissions_controller.instance_variable_set(:@raw_output, raw_output)
+      submissions_controller.instance_variable_set(:@submission, submission)
+      submissions_controller.extract_errors
+    end
+
+    drop_table :errors
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index f918e876..82ec19bf 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_11_26_163428) do
+ActiveRecord::Schema.define(version: 2018_11_29_093207) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -81,15 +81,6 @@ ActiveRecord::Schema.define(version: 2018_11_26_163428) do
     t.text "hint"
   end
 
-  create_table "errors", force: :cascade do |t|
-    t.integer "execution_environment_id"
-    t.text "message"
-    t.datetime "created_at"
-    t.datetime "updated_at"
-    t.integer "submission_id"
-    t.index ["submission_id"], name: "index_errors_on_submission_id"
-  end
-
   create_table "events", force: :cascade do |t|
     t.string "category"
     t.string "data"
@@ -223,16 +214,6 @@ ActiveRecord::Schema.define(version: 2018_11_26_163428) do
     t.index ["context_id", "context_type"], name: "index_files_on_context_id_and_context_type"
   end
 
-  create_table "hints", force: :cascade do |t|
-    t.integer "execution_environment_id"
-    t.string "locale", limit: 255
-    t.text "message"
-    t.string "name", limit: 255
-    t.string "regular_expression", limit: 255
-    t.datetime "created_at"
-    t.datetime "updated_at"
-  end
-
   create_table "internal_users", force: :cascade do |t|
     t.integer "consumer_id"
     t.string "email", limit: 255
diff --git a/db/seeds/development.rb b/db/seeds/development.rb
index fab9a989..b266a20b 100644
--- a/db/seeds/development.rb
+++ b/db/seeds/development.rb
@@ -10,17 +10,11 @@ Rails.application.routes.default_url_options = Rails.application.config.action_m
 # execution environments
 ExecutionEnvironment.create_factories
 
-# errors
-CodeOcean::Error.create_factories
-
 # exercises
 @exercises = find_factories_by_class(Exercise).map(&:name).map { |factory_name| [factory_name, FactoryBot.create(factory_name)] }.to_h
 
 # file types
 FileType.create_factories
 
-# hints
-Hint.create_factories
-
 # submissions
 FactoryBot.create(:submission, exercise: @exercises[:fibonacci])
diff --git a/db/seeds/production.rb b/db/seeds/production.rb
index 5b63f57b..ad12ee2c 100644
--- a/db/seeds/production.rb
+++ b/db/seeds/production.rb
@@ -25,9 +25,6 @@ Exercise.create_factories
 # file types
 FileType.create_factories
 
-# hints
-Hint.create_factories
-
 # change all resources' author
 [ExecutionEnvironment, Exercise, FileType].each do |model|
   model.update_all(user_id: InternalUser.first.id)
diff --git a/lib/whistleblower.rb b/lib/whistleblower.rb
deleted file mode 100644
index 43876494..00000000
--- a/lib/whistleblower.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-class Whistleblower
-  PLACEHOLDER_REGEXP = /\$(\d)/
-
-  def find_hint(stderr)
-    @execution_environment.hints.detect do |hint|
-      @matches = Regexp.new(hint.regular_expression).match(stderr)
-    end
-  end
-  private :find_hint
-
-  def generate_hint(stderr)
-    if hint = find_hint(stderr)
-      hint.message.gsub(PLACEHOLDER_REGEXP) { @matches[Regexp.last_match(1).to_i] }
-    end
-  end
-
-  def initialize(options = {})
-    @execution_environment = options[:execution_environment]
-  end
-end
diff --git a/spec/controllers/hints_controller_spec.rb b/spec/controllers/hints_controller_spec.rb
deleted file mode 100644
index d95b7efe..00000000
--- a/spec/controllers/hints_controller_spec.rb
+++ /dev/null
@@ -1,103 +0,0 @@
-require 'rails_helper'
-
-describe HintsController do
-  let(:execution_environment) { FactoryBot.create(:ruby) }
-  let(:hint) { FactoryBot.create(:ruby_syntax_error) }
-  let(:user) { FactoryBot.create(:admin) }
-  before(:each) { allow(controller).to receive(:current_user).and_return(user) }
-
-  describe 'POST #create' do
-    context 'with a valid hint' do
-      let(:perform_request) { proc { post :create, params: { execution_environment_id: execution_environment.id, hint: FactoryBot.attributes_for(:ruby_syntax_error) } } }
-      before(:each) { perform_request.call }
-
-      expect_assigns(execution_environment: :execution_environment)
-      expect_assigns(hint: Hint)
-
-      it 'creates the hint' do
-        expect { perform_request.call }.to change(Hint, :count).by(1)
-      end
-
-      expect_redirect(Hint.last)
-    end
-
-    context 'with an invalid hint' do
-      before(:each) { post :create, params: { execution_environment_id: execution_environment.id, hint: {} } }
-
-      expect_assigns(execution_environment: :execution_environment)
-      expect_assigns(hint: Hint)
-      expect_status(200)
-      expect_template(:new)
-    end
-  end
-
-  describe 'DELETE #destroy' do
-    before(:each) { delete :destroy, params: { execution_environment_id: execution_environment.id, id: hint.id } }
-
-    expect_assigns(execution_environment: :execution_environment)
-    expect_assigns(hint: Hint)
-
-    it 'destroys the hint' do
-      hint = FactoryBot.create(:ruby_syntax_error)
-      expect { delete :destroy, params: { execution_environment_id: execution_environment.id, id: hint.id } }.to change(Hint, :count).by(-1)
-    end
-
-    expect_redirect { execution_environment_hints_path(execution_environment) }
-  end
-
-  describe 'GET #edit' do
-    before(:each) { get :edit, params: { execution_environment_id: execution_environment.id, id: hint.id } }
-
-    expect_assigns(execution_environment: :execution_environment)
-    expect_assigns(hint: Hint)
-    expect_status(200)
-    expect_template(:edit)
-  end
-
-  describe 'GET #index' do
-    before(:all) { FactoryBot.create_pair(:ruby_syntax_error) }
-    before(:each) { get :index, params: { execution_environment_id: execution_environment.id } }
-
-    expect_assigns(execution_environment: :execution_environment)
-    expect_assigns(hints: Hint.all)
-    expect_status(200)
-    expect_template(:index)
-  end
-
-  describe 'GET #new' do
-    before(:each) { get :new, params: { execution_environment_id: execution_environment.id } }
-
-    expect_assigns(execution_environment: :execution_environment)
-    expect_assigns(hint: Hint)
-    expect_status(200)
-    expect_template(:new)
-  end
-
-  describe 'GET #show' do
-    before(:each) { get :show, params: { execution_environment_id: execution_environment.id, id: hint.id } }
-
-    expect_assigns(execution_environment: :execution_environment)
-    expect_assigns(hint: :hint)
-    expect_status(200)
-    expect_template(:show)
-  end
-
-  describe 'PUT #update' do
-    context 'with a valid hint' do
-      before(:each) { put :update, params: { execution_environment_id: execution_environment.id, hint: FactoryBot.attributes_for(:ruby_syntax_error), id: hint.id } }
-
-      expect_assigns(execution_environment: :execution_environment)
-      expect_assigns(hint: Hint)
-      expect_redirect { hint }
-    end
-
-    context 'with an invalid hint' do
-      before(:each) { put :update, params: { execution_environment_id: execution_environment.id, hint: {name: ''}, id: hint.id } }
-
-      expect_assigns(execution_environment: :execution_environment)
-      expect_assigns(hint: Hint)
-      expect_status(200)
-      expect_template(:edit)
-    end
-  end
-end
diff --git a/spec/controllers/submissions_controller_spec.rb b/spec/controllers/submissions_controller_spec.rb
index 497318e0..6aaf8555 100644
--- a/spec/controllers/submissions_controller_spec.rb
+++ b/spec/controllers/submissions_controller_spec.rb
@@ -157,40 +157,6 @@ describe SubmissionsController do
 
       pending("todo")
     end
-
-    context 'when an error occurs during execution' do
-      let(:stderr) { "undefined method `foo' for main:Object (NoMethodError)" }
-
-      before(:each) do
-        expect_any_instance_of(DockerClient).to receive(:execute_run_command).with(submission, filename).and_yield(:stderr, stderr)
-      end
-
-      after(:each) { perform_request }
-
-      context 'when the error is covered by a hint' do
-        let(:hint) { "Your object 'main' of class 'Object' does not understand the method 'foo'." }
-
-        before(:each) do
-          expect_any_instance_of(Whistleblower).to receive(:generate_hint).with(stderr).and_return(hint)
-        end
-
-        it 'does not store the error' do
-          pending("no server sent events used right now")
-          expect(CodeOcean::Error).not_to receive(:create)
-        end
-      end
-
-      context 'when the error is not covered by a hint' do
-        before(:each) do
-          expect_any_instance_of(Whistleblower).to receive(:generate_hint).with(stderr)
-        end
-
-        it 'stores the error' do
-          pending("no server sent events used right now")
-          expect(CodeOcean::Error).to receive(:create).with(execution_environment_id: submission.exercise.execution_environment_id, message: stderr)
-        end
-      end
-    end
   end
 
   describe 'GET #show' do
diff --git a/spec/factories/code_ocean/error.rb b/spec/factories/code_ocean/error.rb
deleted file mode 100644
index 0bcae320..00000000
--- a/spec/factories/code_ocean/error.rb
+++ /dev/null
@@ -1,6 +0,0 @@
-FactoryBot.define do
-  factory :error, class: CodeOcean::Error do
-    association :execution_environment, factory: :ruby
-    message { "exercise.rb:4:in `<main>': undefined local variable or method `foo' for main:Object (NameError)" }
-  end
-end
diff --git a/spec/factories/hint.rb b/spec/factories/hint.rb
deleted file mode 100644
index ec1aba9d..00000000
--- a/spec/factories/hint.rb
+++ /dev/null
@@ -1,101 +0,0 @@
-FactoryBot.define do
-  factory :node_js_invalid_assignment, class: Hint do
-    association :execution_environment, factory: :node_js
-    english
-    message { 'There was an error with an assignment. Maybe you have to use the equality operator here.' }
-    name { 'Invalid assignment' }
-    regular_expression { 'Invalid left-hand side in assignment' }
-  end
-
-  factory :node_js_reference_error, class: Hint do
-    association :execution_environment, factory: :node_js
-    english
-    message { "'$1' is not defined." }
-    name { 'ReferenceError' }
-    regular_expression { 'ReferenceError: (\w+) is not defined' }
-  end
-
-  factory :node_js_syntax_error, class: Hint do
-    association :execution_environment, factory: :node_js
-    english
-    message { 'You seem to have made a typo.' }
-    name { 'SyntaxError' }
-    regular_expression { 'SyntaxError: Unexpected token (\w+)' }
-  end
-
-  factory :ruby_load_error, class: Hint do
-    association :execution_environment, factory: :ruby
-    english
-    message { "The file '$1' cannot be found." }
-    name { 'LoadError' }
-    regular_expression { 'cannot load such file -- (\w+) (LoadError)' }
-  end
-
-  factory :ruby_name_error_constant, class: Hint do
-    association :execution_environment, factory: :ruby
-    english
-    message { "The constant '$1' is not defined." }
-    name { 'NameError (uninitialized constant)' }
-    regular_expression { 'uninitialized constant (\w+) \(NameError\)' }
-  end
-
-  factory :ruby_name_error_variable, class: Hint do
-    association :execution_environment, factory: :ruby
-    english
-    message { "Your object '$2' of class '$3' does not know what '$1' is. Maybe you made a typo or still have to define '$1'." }
-    name { 'NameError (undefined local variable or method)' }
-    regular_expression { 'undefined local variable or method `(\w+)\' for (\w+):(\w+) \(NameError\)' }
-  end
-
-  factory :ruby_no_method_error, class: Hint do
-    association :execution_environment, factory: :ruby
-    english
-    message { "Your object '$2' of class '$3' does not understand the method '$1'. Maybe you made a typo or still have to implement that method." }
-    name { 'NoMethodError' }
-    regular_expression { 'undefined method `([\w\!\?=\[\]]+)\' for (\w+):(\w+) \(NoMethodError\)' }
-  end
-
-  factory :ruby_syntax_error, class: Hint do
-    association :execution_environment, factory: :ruby
-    english
-    message { 'You seem to have made a typo.' }
-    name { 'SyntaxError' }
-    regular_expression { 'syntax error' }
-  end
-
-  factory :ruby_system_stack_error, class: Hint do
-    association :execution_environment, factory: :ruby
-    english
-    message { 'You seem to have built an infinite loop or recursion.' }
-    name { 'SystemStackError' }
-    regular_expression { 'stack level too deep \(SystemStackError\)' }
-  end
-
-  factory :sqlite_no_such_column, class: Hint do
-    association :execution_environment, factory: :sqlite
-    english
-    message { "The column '$1' does not exist." }
-    name { 'No Such Column' }
-    regular_expression { 'no such column: (\w+)' }
-  end
-
-  factory :sqlite_no_such_table, class: Hint do
-    association :execution_environment, factory: :sqlite
-    english
-    message { "The table '$1' does not exist." }
-    name { 'No Such Table' }
-    regular_expression { 'no such table: (\w+)' }
-  end
-
-  factory :sqlite_syntax_error, class: Hint do
-    association :execution_environment, factory: :sqlite
-    english
-    message { "You seem to have made a typo near '$1'." }
-    name { 'SyntaxError' }
-    regular_expression { 'near "(\w+)": syntax error' }
-  end
-
-  trait :english do
-    locale { 'en' }
-  end
-end
diff --git a/spec/lib/whistleblower_spec.rb b/spec/lib/whistleblower_spec.rb
deleted file mode 100644
index e0a8a8d9..00000000
--- a/spec/lib/whistleblower_spec.rb
+++ /dev/null
@@ -1,28 +0,0 @@
-require 'rails_helper'
-
-describe Whistleblower do
-  let(:hint) { FactoryBot.create(:ruby_no_method_error) }
-  let(:stderr) { "undefined method `foo' for main:Object (NoMethodError)" }
-  let(:whistleblower) { described_class.new(execution_environment: hint.execution_environment) }
-
-  describe '#find_hint' do
-    let(:find_hint) { whistleblower.send(:find_hint, stderr) }
-
-    it 'finds the hint' do
-      expect(find_hint).to eq(hint)
-    end
-
-    it 'stores the matches' do
-      find_hint
-      expect(whistleblower.instance_variable_get(:@matches)).to be_a(MatchData)
-    end
-  end
-
-  describe '#generate_hint' do
-    it 'returns the customized hint message' do
-      message = whistleblower.generate_hint(stderr)
-      expect(message[0..9]).to eq(hint.message[0..9])
-      expect(message[-10..-1]).to eq(hint.message[-10..-1])
-    end
-  end
-end
diff --git a/spec/models/code_ocean/error_spec.rb b/spec/models/code_ocean/error_spec.rb
deleted file mode 100644
index aa111b3c..00000000
--- a/spec/models/code_ocean/error_spec.rb
+++ /dev/null
@@ -1,19 +0,0 @@
-require 'rails_helper'
-
-describe CodeOcean::Error do
-  let(:error) { described_class.create }
-
-  it 'validates the presence of an execution environment' do
-    expect(error.errors[:execution_environment_id]).to be_present
-  end
-
-  it 'validates the presence of a message' do
-    expect(error.errors[:message]).to be_present
-  end
-
-  describe '.nested_resource?' do
-    it 'is true' do
-      expect(described_class.nested_resource?).to be true
-    end
-  end
-end
diff --git a/spec/models/hint_spec.rb b/spec/models/hint_spec.rb
deleted file mode 100644
index 87e04b51..00000000
--- a/spec/models/hint_spec.rb
+++ /dev/null
@@ -1,37 +0,0 @@
-require 'rails_helper'
-
-describe Hint do
-  let(:hint) { described_class.create }
-
-  it 'validates the presence of an execution environment' do
-    expect(hint.errors[:execution_environment_id]).to be_present
-  end
-
-  it 'validates the presence of a locale' do
-    expect(hint.errors[:locale]).to be_present
-  end
-
-  it 'validates the presence of a message' do
-    expect(hint.errors[:message]).to be_present
-  end
-
-  it 'validates the presence of a name' do
-    expect(hint.errors[:name]).to be_present
-  end
-
-  it 'validates the presence of a regular expression' do
-    expect(hint.errors[:regular_expression]).to be_present
-  end
-
-  describe '.nested_resource?' do
-    it 'is true' do
-      expect(described_class.nested_resource?).to be true
-    end
-  end
-
-  describe '#to_s' do
-    it "equals the hint's name" do
-      expect(hint.to_s).to eq(hint.name)
-    end
-  end
-end
diff --git a/spec/policies/code_ocean/error_policy_spec.rb b/spec/policies/code_ocean/error_policy_spec.rb
deleted file mode 100644
index 71ff72d5..00000000
--- a/spec/policies/code_ocean/error_policy_spec.rb
+++ /dev/null
@@ -1,41 +0,0 @@
-require 'rails_helper'
-
-describe CodeOcean::ErrorPolicy do
-  subject { described_class }
-
-  let(:error) { FactoryBot.build(:error) }
-
-  [:create?, :index?, :new?].each do |action|
-    permissions(action) do
-      it 'grants access to admins' do
-        expect(subject).to permit(FactoryBot.build(:admin), error)
-      end
-
-      it 'grants access to teachers' do
-        expect(subject).to permit(FactoryBot.build(:teacher), error)
-      end
-
-      it 'does not grant access to external users' do
-        expect(subject).not_to permit(FactoryBot.build(:external_user), error)
-      end
-    end
-  end
-
-  [:destroy?, :edit?, :show?, :update?].each do |action|
-    permissions(action) do
-      it 'grants access to admins' do
-        expect(subject).to permit(FactoryBot.build(:admin), error)
-      end
-
-      it 'grants access to authors' do
-        expect(subject).to permit(error.execution_environment.author, error)
-      end
-
-      it 'does not grant access to all other users' do
-        [:external_user, :teacher].each do |factory_name|
-          expect(subject).not_to permit(FactoryBot.build(factory_name), error)
-        end
-      end
-    end
-  end
-end
diff --git a/spec/policies/hint_policy_spec.rb b/spec/policies/hint_policy_spec.rb
deleted file mode 100644
index 2aa9d9e5..00000000
--- a/spec/policies/hint_policy_spec.rb
+++ /dev/null
@@ -1,41 +0,0 @@
-require 'rails_helper'
-
-describe HintPolicy do
-  subject { described_class }
-
-  let(:hint) { FactoryBot.build(:ruby_no_method_error) }
-
-  [:create?, :index?, :new?].each do |action|
-    permissions(action) do
-      it 'grants access to admins' do
-        expect(subject).to permit(FactoryBot.build(:admin), hint)
-      end
-
-      it 'grants access to teachers' do
-        expect(subject).to permit(FactoryBot.build(:teacher), hint)
-      end
-
-      it 'does not grant access to external users' do
-        expect(subject).not_to permit(FactoryBot.build(:external_user), hint)
-      end
-    end
-  end
-
-  [:destroy?, :edit?, :show?, :update?].each do |action|
-    permissions(action) do
-      it 'grants access to admins' do
-        expect(subject).to permit(FactoryBot.build(:admin), hint)
-      end
-
-      it 'grants access to authors' do
-        expect(subject).to permit(hint.execution_environment.author, hint)
-      end
-
-      it 'does not grant access to all other users' do
-        [:external_user, :teacher].each do |factory_name|
-          expect(subject).not_to permit(FactoryBot.build(factory_name), hint)
-        end
-      end
-    end
-  end
-end
diff --git a/spec/views/exercises/implement.html.slim_spec.rb b/spec/views/exercises/implement.html.slim_spec.rb
index 7c5e641a..fe9ab0d0 100644
--- a/spec/views/exercises/implement.html.slim_spec.rb
+++ b/spec/views/exercises/implement.html.slim_spec.rb
@@ -14,7 +14,6 @@ describe 'exercises/implement.html.slim' do
   end
 
   it 'contains the required editor data attributes' do
-    expect(rendered).to have_css("#editor[data-errors-url='#{execution_environment_errors_path(exercise.execution_environment)}']")
     expect(rendered).to have_css("#editor[data-exercise-id='#{exercise.id}']")
     expect(rendered).to have_css('#editor[data-message-timeout]')
     expect(rendered).to have_css("#editor[data-submissions-url='#{submissions_path}']")