Fatal error: Uncaught Error: Interface "Symfony\Component\EventDispatcher\EventSubscriberInterface" not found in /home/steevedfem/ekolaweb/vendor/friendsofsymfony/user-bundle/EventListener/FlashListener.php:20 Stack trace: #0 {main} thrown in /home/steevedfem/ekolaweb/vendor/friendsofsymfony/user-bundle/EventListener/FlashListener.php on line 20