Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/astechc1/public_html/vendor/vich/uploader-bundle/src/Event/Event.php:13 Stack trace: #0 {main} thrown in /home/astechc1/public_html/vendor/vich/uploader-bundle/src/Event/Event.php on line 13