Sprockets::FileNotFound当使用select2 gem与Rails 3.2.8

我正在尝试测试一个示例Rails应用程序使用select2 gem。我已经安装gem以下select2-rails。

但是，不幸的是，我得到以下错误:

Sprockets::FileNotFound in Home#index
Showing /Users/Rakib/Desktop/Development/TEST_PROJECTS/selecttest/app/views/layouts/application.html.erb where line #5 raised:
couldn't find file 'select2'
  (in /Users/Rakib/Desktop/Development/TEST_PROJECTS/selecttest/app/assets/stylesheets/application.css:14)
Extracted source (around line #5):
2: <html>
3: <head>
4:   <title>Selecttest</title>
5:   <%= stylesheet_link_tag    "application", :media => "all" %>
6:   <%= javascript_include_tag "application" %>
7:   <%= csrf_meta_tags %>
8: </head>
Rails.root: /Users/Rakib/Desktop/Development/TEST_PROJECTS/selecttest

我的Gemfile是:

source 'https://rubygems.org'
gem 'rails', '3.2.8'
gem 'sqlite3'
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
gem 'jquery-rails'
gem "select2-rails"

application.js is:

//= require jquery
//= require jquery_ujs
//= require select2
//= require_tree .

application.css is:

 *= require_self
 *= require_tree .
 *= require select2

我遇到了同样的问题。重新启动服务器解决问题

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