Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in C:\SistemasPHP\observatorio4\vendor\symfony\http-kernel\Event\KernelEvent.php:23 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony\http-kernel\Event\KernelEvent.php on line 23