Fatal error: Uncaught Error: Interface "ilCtrlBaseClassInterface" not found in /var/www/html/ilias/components/ILIAS/File/classes/Preview/class.ilObjFilePreviewRendererGUI.php:34 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/File/classes/Preview/class.ilObjFilePreviewRendererGUI.php on line 34