Fatal error: Uncaught Error: Interface "ILIAS\BookingManager\BookingProcess\BookingProcessGUI" not found in /var/www/html/ilias/components/ILIAS/BookingManager/BookingProcess/class.ilBookingProcessWithoutScheduleGUI.php:23 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/BookingManager/BookingProcess/class.ilBookingProcessWithoutScheduleGUI.php on line 23