Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in C:\SistemasPHP\observatorio4\vendor\symfony-cmf\routing\src\Event\RouterGenerateEvent.php:27 Stack trace: #0 {main} thrown in C:\SistemasPHP\observatorio4\vendor\symfony-cmf\routing\src\Event\RouterGenerateEvent.php on line 27