Fatal error: Uncaught Error: Interface "ilDatabaseUpdateSteps" not found in /var/www/html/ilias/components/ILIAS/Course/Setup/ilCourseDBUpdateSteps.php:21 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Course/Setup/ilCourseDBUpdateSteps.php on line 21