Fatal error: Uncaught Error: Interface "ilTimelineItemInt" not found in /var/www/html/ilias/components/ILIAS/LearningHistory/classes/class.ilLearningHistoryTimelineItem.php:22 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/LearningHistory/classes/class.ilLearningHistoryTimelineItem.php on line 22