Fatal error: Uncaught Error: Class "ilTree" not found in /var/www/html/ilias/components/ILIAS/PersonalWorkspace/classes/class.ilWorkspaceTree.php:24 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/PersonalWorkspace/classes/class.ilWorkspaceTree.php on line 24