Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in C:\Apache24\htdocs\cwbts\vendor\symfony\doctrine-bridge\Validator\Constraints\UniqueEntity.php:25 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cwbts\vendor\symfony\doctrine-bridge\Validator\Constraints\UniqueEntity.php on line 25