Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Exception\ConstraintViolationException' not found in /home/edmedu/www/edmclass.com.bak/edmclass-admin/vendor/doctrine/dbal/src/Exception/NotNullConstraintViolationException.php:10 Stack trace: #0 {main} thrown in /home/edmedu/www/edmclass.com.bak/edmclass-admin/vendor/doctrine/dbal/src/Exception/NotNullConstraintViolationException.php on line 10