Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Event\KernelEvent' not found in E:\xampp\htdocs\vendor\symfony\http-kernel\Event\FilterControllerEvent.php:28 Stack trace: #0 {main} thrown in E:\xampp\htdocs\vendor\symfony\http-kernel\Event\FilterControllerEvent.php on line 28