Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Event\KernelEvent' not found in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\Event\ControllerArgumentsEvent.php:29 Stack trace: #0 {main} thrown in C:\xampp\htdocs\admin\vendor\symfony\http-kernel\Event\ControllerArgumentsEvent.php on line 29