title: Symfony2: Fatal error: Interface 'Knp\Menu\Matcher\Voter\VoterInterface' not found in
body: <p>I wanted to integrate twitter-bootstrap in my Symfony2 project and trying to make it work, I followed documentation is <a href="https://github.com/phiamo/MopaBootstrapBundle/blob/master/Resources/doc/1-installation.md" rel="nofollow">BootstrapBundle</a>.
  After installing all dependencies set in <code>composer.json</code>, i get this error:</p>
  
  <blockquote>
    <p>Fatal error: Interface 'Knp\Menu\Matcher\Voter\VoterInterface' not found in /var/www/cv-  editor/vendor/mopa/bootstrap-sandbox-bundle/Mopa/Bundle/BootstrapSandboxBundle/Navbar/Example/Voter/RequestVoter.php on line 12 </p>
  </blockquote>
  
  <p>Have you any idea ?</p>