Fatal error: Uncaught Error: Class "ilCalendarViewGUI" not found in /var/www/html/ilias/components/ILIAS/Calendar/classes/class.ilCalendarInboxGUI.php:31 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Calendar/classes/class.ilCalendarInboxGUI.php on line 31