title: Class 'Symfony\Component\HttpKernel\DependencyInjection\ConfigurableExtension' not found
body: <p>After installing <a href="https://github.com/schmittjoh/JMSSerializerBundle" rel="nofollow">JMS Serializer Bundle</a> following the <a href="http://jmsyst.com/bundles/JMSSerializerBundle/master/installation#using-the-deps-file-symfony-2-0-x" rel="nofollow">provided instructions using the deps file</a>, I get the following error:</p>
  
  <pre><code>Fatal error: Class 'Symfony\Component\HttpKernel\DependencyInjection\ConfigurableExtension' not found in /vendor/bundles/JMS/SerializerBundle/DependencyInjection/JMSSerializerExtension.php on line 30
  </code></pre>
  
  <p>The class does not exist within Symfony. I am using Symfony v2.0.17. Is there any fix for this?</p>