Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\Event\RequestEvent" not found in D:\Apache24\www\qilu_sap\back-end\vendor\symfony\http-kernel\Event\ViewEvent.php:26 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu_sap\back-end\vendor\symfony\http-kernel\Event\ViewEvent.php on line 26