Fatal error: Uncaught Error: Class "ilLearningSequencePageObjectGUI" not found in /var/www/html/ilias/components/ILIAS/LearningSequence/classes/PageEditor/class.ilObjLearningSequenceEditIntroGUI.php:25 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/LearningSequence/classes/PageEditor/class.ilObjLearningSequenceEditIntroGUI.php on line 25