Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Schema\Synchronizer\AbstractSchemaSynchronizer' not found in /var/www/typo3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Synchronizer/SingleDatabaseSynchronizer.php:18 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/Synchronizer/SingleDatabaseSynchronizer.php on line 18