Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Event\RequestEvent' not found in C:\SistemasPHP\observatorio4\vendor\symfony\http-kernel\Event\GetResponseForExceptionEvent.php:21 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony\http-kernel\Event\GetResponseForExceptionEvent.php on line 21