Fatal error: Uncaught Error: Class "Doctrine\DBAL\Exception\ConstraintViolationException" not found in C:\xampp\htdocs\cms-propay\vendor\doctrine\dbal\src\Exception\NotNullConstraintViolationException.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\cms-propay\vendor\doctrine\dbal\src\Exception\NotNullConstraintViolationException.php on line 8