Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Event\SchemaEventArgs' not found in /mnt/volume_lon1_01/backend/admin/vendor/doctrine/dbal/lib/Doctrine/DBAL/Event/SchemaAlterTableAddColumnEventArgs.php:15 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/doctrine/dbal/lib/Doctrine/DBAL/Event/SchemaAlterTableAddColumnEventArgs.php on line 15