Fatal error: Uncaught Error: Class "ilCalendarAppointmentBaseFactory" not found in /var/www/html/ilias/components/ILIAS/Calendar/classes/FileHandler/class.ilAppointmentFileHandlerFactory.php:9 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Calendar/classes/FileHandler/class.ilAppointmentFileHandlerFactory.php on line 9