Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in C:\Apache24\htdocs\cwbts\vendor\nucleos\dompdf-bundle\src\Event\OutputEvent.php:17 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cwbts\vendor\nucleos\dompdf-bundle\src\Event\OutputEvent.php on line 17