Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in C:\xampp\htdocs\ApiSigestWin\vendor\vich\uploader-bundle\src\Event\Event.php:13 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\vendor\vich\uploader-bundle\src\Event\Event.php on line 13