Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Constraint" not found in D:\xampp\htdocs\pimcore\my-project\vendor\symfony-cmf\routing-bundle\src\Validator\Constraints\RouteDefaults.php:16 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\symfony-cmf\routing-bundle\src\Validator\Constraints\RouteDefaults.php on line 16