Fatal error: Uncaught Error: Interface "ILIAS\EmployeeTalk\Notification\Calendar\VCalendarGeneratorInterface" not found in /var/www/html/ilias/components/ILIAS/EmployeeTalk/classes/Notification/Calendar/VCalendarGenerator.php:23 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/EmployeeTalk/classes/Notification/Calendar/VCalendarGenerator.php on line 23