title: Sprockets::FileNotFound: couldn't find file 'jquery' with type 'application/javascript' Heroku in Rails App
body: <p>I'm trying to deploy my rails app to heroku but push to heroku is rejected due to: "Sprockets::FileNotFound: couldn't find file 'jquery' with type 'application/javascript'".
  <a href="https://i.stack.imgur.com/xgEBW.png" rel="noreferrer">I've also attached a screenshot of the error</a></p>
  
  <p>This is my gemfile:</p>
  
  <pre><code>source 'https://rubygems.org'
  
  git_source(:github) do |repo_name|
    repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
    "https://github.com/#{repo_name}.git"
  end
  
  
  # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
  gem 'rails', '~&gt; 5.1.2'
  gem 'jquery-rails'
  gem 'jquery-ui-rails'
  
  # Use postgresql as the database for Active Record
  gem 'pg', '~&gt; 0.18'
  # Use Puma as the app server
  gem 'puma', '~&gt; 3.7'
  # Use SCSS for stylesheets
  gem 'sass-rails', '~&gt; 5.0'
  # Use Uglifier as compressor for JavaScript assets
  gem 'uglifier', '&gt;= 1.3.0'
  # See https://github.com/rails/execjs#readme for more supported runtimes
  gem 'therubyracer', platforms: :ruby
  
  # Use CoffeeScript for .coffee assets and views
  gem 'coffee-rails', '~&gt; 4.2'
  # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
  gem 'turbolinks', '~&gt; 5'
  # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
  gem 'jbuilder', '~&gt; 2.5'
  # Use Redis adapter to run Action Cable in production
  # gem 'redis', '~&gt; 3.0'
  # Use ActiveModel has_secure_password
  # gem 'bcrypt', '~&gt; 3.1.7'
  
  # Use Capistrano for deployment
  # gem 'capistrano-rails', group: :development
  
  gem 'bootstrap', '~&gt; 4.0.0.alpha6'
  #Tooltips and popovers depend on tether for positioning
  source 'https://rails-assets.org' do
    gem 'rails-assets-tether', '&gt;= 1.3.3'
  end
  
  gem 'devise'
  gem 'simple_form'
  gem 'carrierwave', '~&gt; 1.0'
  
  group :development, :test do
    # Call 'byebug' anywhere in the code to stop execution and get a debugger console
    gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
    # Adds support for Capybara system testing and selenium driver
    gem 'capybara', '~&gt; 2.13'
    gem 'selenium-webdriver'
    gem 'pry-rails'
  end
  
  group :development do
    # Access an IRB console on exception pages or by using &lt;%= console %&gt; anywhere in the code.
    gem 'web-console', '&gt;= 3.3.0'
    gem 'listen', '&gt;= 3.0.5', '&lt; 3.2'
    # 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', '~&gt; 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]
  </code></pre>
  
  <p>My <code>application.js</code> looks like this</p>
  
  <pre><code>//= require jquery
  //= require jquery_ujs
  //= require jquery-ui
  //= require tether
  //= require bootstrap-sprockets
  //= require rails-ujs
  //= require turbolinks
  //= require_tree 
  </code></pre>
  
  <p>And my <code>application.scss</code> looks like this:</p>
  
  <pre><code> *= require jquery-ui
   *= require_tree .
   *= require_self
   */
   @import "bootstrap";
  </code></pre>
  
  <p>The application runs fine locally but I can't seem to push to heroku. I've already tried <code>rake assets:precompile</code> and committing the changes before pushing to heroku but still no luck.</p>