Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Schema\Visitor\AbstractVisitor' not found in /mnt/volume_lon1_01/backend/admin/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Visitor/RemoveNamespacedAssets.php:21 Stack trace: #0 {main} thrown in /mnt/volume_lon1_01/backend/admin/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Visitor/RemoveNamespacedAssets.php on line 21