Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Event/PersistenceEvent.php:30 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/admin-bundle/Event/PersistenceEvent.php on line 30