Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Event\GetResponseEvent' not found in /home/app/htdocs/message_gateway/vendor/symfony/http-kernel/Event/GetResponseForExceptionEvent.php:30 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/symfony/http-kernel/Event/GetResponseForExceptionEvent.php on line 30