Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\Event\ControllerMetadata" not found in C:\wamp64\houda\vendor\symfony\http-kernel\Event\ControllerArgumentsMetadata.php:21 Stack trace: #0 {main} thrown in C:\wamp64\houda\vendor\symfony\http-kernel\Event\ControllerArgumentsMetadata.php on line 21