Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in D:\xampp\htdocs\pimcore\my-project\vendor\symfony-cmf\routing\src\Event\RouterMatchEvent.php:17 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\symfony-cmf\routing\src\Event\RouterMatchEvent.php on line 17