找不到'jquery'文件

mar*_*ion 2 jquery ruby-on-rails turbolinks

这是我现在得到的错误:

Started GET "/" for 127.0.0.1 at 2014-08-29 06:37:21 -0500
  ActiveRecord::SchemaMigration Load (0.9ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by PostsController#index as HTML
  Post Load (0.8ms)  SELECT "posts".* FROM "posts"   ORDER BY created_at desc
  Rendered shared/_color.html.erb (0.6ms)
  Rendered shared/_color.html.erb (0.1ms)
  Rendered shared/_color.html.erb (0.3ms)
  Rendered posts/index.html.erb within layouts/application (47.4ms)
Completed 500 Internal Server Error in 264ms

Sprockets::FileNotFound - couldn't find file 'jquery'
  (in /app/assets/javascripts/application.js:13):
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这是我的application.js,

//= require jquery    <--- This is Line 13
//= require jquery_ujs
//= require jquery-ui
//= require jquery.turbolinks
//= require bootstrap
//= require social-share-button
//= require turbolinks
//= require_tree .
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这是我的Gemfile:

source 'https://rubygems.org'

gem 'rails', '4.1.1'

group :assets do
  gem 'sass-rails', '~> 4.0.3'
  gem 'uglifier', '>= 1.3.0'
  gem 'coffee-rails', '~> 4.0.0'
  gem "font-awesome-rails"
  gem 'bootstrap-sass', '~> 3.2.0'
  gem 'autoprefixer-rails'
  gem 'jquery-rails'
  gem 'jquery-turbolinks'  
  gem 'turbolinks'
end

group :development do
    gem 'annotate', github: 'ctran/annotate_models'
    gem 'sextant'
  gem "quiet_assets", ">= 1.0.2"
  gem 'better_errors', '~> 1.1.0'
  gem 'binding_of_caller', '~> 0.7.2'
    gem 'meta_request'
    gem 'execjs'
    gem 'therubyracer'  
  gem "letter_opener"
  gem 'bullet'   
  gem 'rack-mini-profiler'     
  gem 'guard-rails'
  gem 'rb-fchange', :require => false
  gem 'rb-fsevent', :require => false
  gem 'rb-inotify', :require => false
  gem 'guard-livereload', '~> 2.3.0', :require => false
  gem 'rack-livereload', '~> 0.3.15'
  gem 'spring'
end

group :production do
  gem 'rails_12factor'
end

gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0',          group: :doc
gem 'devise', '~> 3.2.4'
gem 'thin'
gem 'pg'
gem 'cancancan', '~> 1.8.2'
gem 'rolify'
gem 'rmagick', :require => 'RMagick'
gem "mini_magick"
gem 'carrierwave', '~> 0.10.0'
gem "fog", "~> 1.3.1"
gem 'figaro', '~> 0.7.0'
gem 'geocoder', '~> 1.2.2'
gem 'social-share-button', '~> 0.1.6'
gem 'ancestry', '~> 2.1.0'
gem "simple_form"
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这是我的application.html.erb:

<!DOCTYPE html>
<html>
<head>
  <title>My Site</title>
  <!-- Style sheet -->
    <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>

  <!-- Javascript -->
    <%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
  <!-- Fonts -->
    <link href="http://fonts.googleapis.com/css?family=Source+Sans+Pro%3A400%2C400italic%2C700" rel="stylesheet">
    <link href="http://fonts.googleapis.com/css?family=Varela+Round" rel="stylesheet">

  <!-- MISC -->
  <link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">
  <%= csrf_meta_tags %>
  <%= yield :head %>
</head>
<body>

<%= render partial: "shared/nav" %>
  <% if notice %> <div class="alert alert-info"> <%= notice %> </div> <% end %>
  <% if alert %> <div class="alert alert-warning"> <%= alert %> </div> <% end %>
<%= yield %>

</body>
</html>
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可能导致此错误的原因是什么?