Fatal error: Uncaught Error: Class "ilContainerReferenceImporter" not found in /var/www/html/ilias/components/ILIAS/CourseReference/classes/class.ilCourseReferenceImporter.php:14 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/CourseReference/classes/class.ilCourseReferenceImporter.php on line 14