title: None of the rails  command  working
body: <p>Whenever I am trying to start the server by using  the following command:-</p>
  
  <pre><code>/Demo$ rails s
  </code></pre>
  
  <p>It is showing me that the I have invalid dates.</p>
  
  <pre><code>Invalid gemspec in [/var/lib/gems/1.8/specifications/jquery-rails-1.0.19.gemspec]: invalid   
  date format in specification: "2011-11-26 00:00:00.000000000Z"
  
  Invalid gemspec in [/var/lib/gems/1.8/specifications/tilt-1.3.3.gemspec]: invalid date                    
  format in specification: "2011-08-25 00:00:00.000000000Z"**strong text**
  
  Could not find tilt-1.3.3 in any of the sources
  Run `bundle install` to install missing gems.
  </code></pre>
  
  <p>And I have also mentioned the gem in  my gemfile and have ran the bundle install.</p>
  
  <p>Same apply  to rails c command, rake commands etc.</p>
  
  <p>Thanks for your help </p>