Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Exception\ConstraintViolationException' not found in E:\xampp\htdocs\www\order\qr251\vendor\doctrine\dbal\src\Exception\UniqueConstraintViolationException.php:8 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\order\qr251\vendor\doctrine\dbal\src\Exception\UniqueConstraintViolationException.php on line 8