Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Schema\AbstractSchemaManager' not found in /var/www/typo3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/DB2SchemaManager.php:21 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/DB2SchemaManager.php on line 21