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