Fatal error: Uncaught Error: Class "ILIAS\MetaData\Elements\Base\BaseElement" not found in /var/www/html/ilias/components/ILIAS/MetaData/classes/Elements/Structure/StructureElement.php:28 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/MetaData/classes/Elements/Structure/StructureElement.php on line 28