Fatal error: Uncaught Error: Interface "ilToolbarItem" not found in /var/www/html/ilias/components/ILIAS/UIComponent/AdvancedSelectionList/classes/class.ilAdvancedSelectionListGUI.php:25 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/UIComponent/AdvancedSelectionList/classes/class.ilAdvancedSelectionListGUI.php on line 25