Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in /home/itscm/dev.its.cm/itsgateway/vendor/vich/uploader-bundle/src/Event/Event.php:13 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/itsgateway/vendor/vich/uploader-bundle/src/Event/Event.php on line 13