How to fix "CoffeeScript not defined" template error

Question

I am trying to open a presentation for my project. but I get this error:

ActionView::Template::Error (ReferenceError: CoffeeScript is not defined):
4:     <title>Myapp</title>
5:     <%= csrf_meta_tags %>
6:
7:     <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
8:     <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
9:   </head>

10:

When I delete lines 7-8, this works, but I would not have CSS or JavaScript.

I did not get this error about a week ago. I'm not sure what the reason is. I tried switching the versions of Rails. I tried uninstalling Postgres and setting it up again, but that doesn't seem to be the problem. I have Rails 5.0.0.1 and "Ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]". I also use Mac OS Sierra.

I can change the “application” to “default” and it works, but I don’t understand why it worked a week ago, and not now.

I also have my view and controller setup, which is why it works when I delete lines 7-8.

This is my gem file:

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.18'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platform: :mri
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
  gem 'web-console'
  gem 'listen', '~> 3.0.5'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Answer 1

coffe- script-source gem 1.12.1, . , . , .

GemFile

gem 'coffee-script-source', '= 1.11.1'

bundle update coffee-script-source, .

Answer 2

gem uninstall coffee-script-source, gem install coffee-script-source... gemfile.lock , "bundle install" "bundle update" coffe- script coffee- script - gemfile.