Fatal error: Uncaught Error: Class "ilXmlExporter" not found in /var/www/html/ilias/components/ILIAS/COPage/classes/class.ilCOPageExporter.php:23 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/COPage/classes/class.ilCOPageExporter.php on line 23