Fatal error: Uncaught Error: Class "ilException" not found in /var/www/html/ilias/components/ILIAS/Calendar/exceptions/class.ilCalCategoriesInitializedMultipleException.php:12 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Calendar/exceptions/class.ilCalCategoriesInitializedMultipleException.php on line 12