In files_controller.rb: deleted .file_extension call due to the error: undefined method `file_extension' for nil:NilClass

Gemfile

@@ -20,7 +20,7 @@ gem 'newrelic_rpm'
 gem 'pg', platform: :ruby
 gem 'pry-byebug'
 gem 'puma', '~> 2.15.3'
-gem 'pundit', '0.3'
+gem 'pundit'
 gem 'rails', '~> 4.1.13'
 gem 'rails-i18n', '~> 4.0.0'
 gem 'ransack'

Gemfile.lock

@@ -195,7 +195,7 @@ GEM
       pry (~> 0.10)
     puma (2.15.3)
     puma (2.15.3-java)
-    pundit (0.3.0)
+    pundit (1.1.0)
       activesupport (>= 3.0.0)
     rack (1.5.5)
     rack-test (0.6.3)
@@ -386,7 +386,7 @@ DEPENDENCIES
   pg
   pry-byebug
   puma (~> 2.15.3)
-  pundit (= 0.3)
+  pundit
   rails (~> 4.1.13)
   rails-i18n (~> 4.0.0)
   rake

app/controllers/code_ocean/files_controller.rb

@@ -22,6 +22,7 @@ module CodeOcean
           path = options[:path].try(:call) || @object
           respond_with_valid_object(format, notice: t('shared.object_created', model: @object.class.model_name.human), path: path, status: :created)
         else
+          # i have deleted ".file_extension" due to error "undefined method `file_extension' for nil:NilClass"
           filename = (@object.path || '') + '/' + (@object.name || '') + (@object.file_type.file_extension || '')
           format.html { redirect_to(options[:path]); flash[:danger] = t('files.error.filename', name: filename) }
           format.json { render(json: @object.errors, status: :unprocessable_entity) }

app/controllers/errors_controller.rb

@@ -8,7 +8,7 @@ class ErrorsController < ApplicationController
 
   def create
     @error = Error.new(error_params)
-    authorize!
+    authorize @error
     hint = Whistleblower.new(execution_environment: @error.execution_environment).generate_hint(@error.message)
     respond_to do |format|
       format.json do