Fatal error: Uncaught Error: Interface 'Symfony\Component\Validator\ConstraintViolationListInterface' not found in /home/benjamincb/demos/acdg/vendor/symfony/validator/ConstraintViolationList.php:21 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg/vendor/symfony/validator/ConstraintViolationList.php on line 21