Fatal error: Uncaught Error: Class "ilException" not found in /var/www/html/ilias/components/ILIAS/BookingManager/Preferences/class.ilBookingCalculationException.php:23 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/BookingManager/Preferences/class.ilBookingCalculationException.php on line 23