Fatal error: Uncaught Error: Interface 'Symfony\Component\EventDispatcher\EventSubscriberInterface' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Form/EventListener/MergeCollectionListener.php:27 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Form/EventListener/MergeCollectionListener.php on line 27