Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in /home/benjamincb/demos/acdg-site/vendor/symfony-cmf/routing-bundle/src/Validator/Constraints/RouteDefaults.php:16 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/symfony-cmf/routing-bundle/src/Validator/Constraints/RouteDefaults.php on line 16