Fatal error: Uncaught Error: Interface "ILIAS\MetaData\Services\DataHelper\DataHelperInterface" not found in /var/www/html/ilias/components/ILIAS/MetaData/classes/Services/DataHelper/DataHelper.php:27 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/MetaData/classes/Services/DataHelper/DataHelper.php on line 27