Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Exception\ConstraintViolationException' not found in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Exception/ForeignKeyConstraintViolationException.php:30 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/doctrine/dbal/lib/Doctrine/DBAL/Exception/ForeignKeyConstraintViolationException.php on line 30