Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\Event\KernelEvent" not found in C:\www\Apache24\htdocs\agenda-dif\vendor\symfony\http-kernel\Event\ResponseEvent.php:27 Stack trace: #0 {main} thrown in C:\www\Apache24\htdocs\agenda-dif\vendor\symfony\http-kernel\Event\ResponseEvent.php on line 27