Fatal error: Uncaught Error: Class "ilObjectGUI" not found in /var/www/html/ilias/components/ILIAS/Chatroom/classes/class.ilChatroomObjectGUI.php:26 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Chatroom/classes/class.ilChatroomObjectGUI.php on line 26