Fatal error: Uncaught Error: Interface "ILIAS\Container\Content\ViewManager" not found in /var/www/html/ilias/components/ILIAS/Container/Content/ObjectiveView/class.ObjectiveViewManager.php:28 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Container/Content/ObjectiveView/class.ObjectiveViewManager.php on line 28