Fatal error: Uncaught Error: Interface "ilDatabaseUpdateSteps" not found in /var/www/html/ilias/components/ILIAS/COPage/classes/Setup/class.ilCOPageHotfix9DBUpdateSteps.php:21 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/COPage/classes/Setup/class.ilCOPageHotfix9DBUpdateSteps.php on line 21