如何修复模板错误“ CoffeeScript未定义”

我正在尝试显示我的项目的视图。但是我得到这个错误：

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：

当我删除第7-8行时，它可以工作，但是我没有CSS或JavaScript。

大约一周前我没有收到此错误。我不确定是什么原因。我尝试切换Rails版本。我尝试过卸载Postgres并重新设置，但这似乎不是问题。我有Rails 5.0.0.1和“ Ruby 2.3.3p222（2016-11-21修订版56859）[x86_64-darwin16]”。另外，我正在使用Mac OS Sierra。

我可以将“应用程序”更改为“默认”，并且可以使用，但是我不明白为什么它大约在一周前（而不是现在）起作用。

我还设置了视图和控制器，这就是删除7-8行时它可以工作的原因。

这是我的宝石文件：

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]