Fatal error: Uncaught Error: Interface "ilForumNotificationMailData" not found in /var/www/html/ilias/components/ILIAS/Forum/classes/Notification/class.ilForumCronNotificationDataProvider.php:25 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Forum/classes/Notification/class.ilForumCronNotificationDataProvider.php on line 25