Fatal error: Uncaught Error: Interface "Symfony\Component\Validator\ConstraintViolationListInterface" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\validator\ConstraintViolationList.php:21 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\validator\ConstraintViolationList.php on line 21