Fatal error: Uncaught Error: Class "ilSubEnabledFormPropertyGUI" not found in /var/www/html/ilias/components/ILIAS/Chatroom/classes/class.ilChatroomAuthInputGUI.php:29 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Chatroom/classes/class.ilChatroomAuthInputGUI.php on line 29