Fatal error: Uncaught Error: Class "Symfony\Component\Validator\ConstraintValidator" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\validator\Constraints\AbstractComparisonValidator.php:28 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\validator\Constraints\AbstractComparisonValidator.php on line 28