Ruby on rails 运行rake-about命令时出错

我在我的linux系统上安装了ruby on rails的所有组件。然后，当我键入命令“rake about”时，以下是错误。plz help

   rake aborted!
   Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a                   list of available runtimes.
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/execjs-1.4.0/lib/execjs/runtimes.rb:51:in `autodetect'
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/execjs-1.4.0/lib/execjs.rb:5
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee_script.rb:1
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-script-2.2.0/lib/coffee-    script.rb:1
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-rails-3.2.2/lib/coffee-  rails.rb:1:in `require'
   /home/imobigeeks1/work/demo/jbuilder/ruby/1.8/gems/coffee-rails-3.2.2/lib/coffee-  rails.rb:1
   /home/imobigeeks1/work/demo/config/application.rb:7
   /home/imobigeeks1/work/demo/Rakefile:5
   (See full trace by running task with --trace)

---

我还使用

gem install execjs

命令安装了javascript，但仍然显示出同样的问题

将

gem'therubyracer'

放在gem文件中，然后从命令行执行

捆绑安装

这块宝石是给你的-

从Ruby调用JavaScript代码并操作JavaScript对象。呼叫
Ruby代码和操作来自JavaScript的Ruby对象

Source-
请格式化您的帖子并在此处提供相关代码，不要参考RepositoriesID您安装了捆绑包吗？\rake中止！找不到JavaScript运行时。是的，我安装的捆绑包版本是1.3.2@ganesh kunwar