Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Event\KernelEvent' not found in /opt/lampp/htdocs/kuesioner/vendor/symfony/http-kernel/Event/FilterControllerEvent.php:20 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/symfony/http-kernel/Event/FilterControllerEvent.php on line 20