Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in /home/eberhardschwarze/public_html/vendor/knplabs/knp-menu-bundle/src/EventListener/VoterInitializerListener.php:18 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/knplabs/knp-menu-bundle/src/EventListener/VoterInitializerListener.php on line 18