Fatal error: Uncaught Error: Class "Doctrine\DBAL\Exception\ConstraintViolationException" not found in /home/bimmertest/BookStack/vendor/doctrine/dbal/src/Exception/ForeignKeyConstraintViolationException.php:10 Stack trace: #0 {main} thrown in /home/bimmertest/BookStack/vendor/doctrine/dbal/src/Exception/ForeignKeyConstraintViolationException.php on line 10