title: Symfony2: ResourceNotFoundException when using extends in a twig template
body: <p>I have over-ridden the exception.html.twig in the following directory:</p>
  
  <pre><code>app/Resources/TwigBundle/views/Exception
  </code></pre>
  
  <p>I have another twig inside another bundle that I'd like to extend, so I did the following:</p>
  
  <pre><code>{% extends 'AcmeMainBundle::layout.html.twig' %}
  </code></pre>
  
  <p>but it always gives me this error:</p>
  
  <pre><code> Fatal error: Uncaught exception 'Symfony\Component\Routing\Exception\ResourceNotFoundException' in /Users/Aditya/Sites/Acme/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/EventListener/RouterListener.php on line 
  </code></pre>
  
  <p>Why is this?</p>