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