Fatal error: Uncaught Error: Interface "ILIAS\UI\HelpTextRetriever" not found in /var/www/html/ilias/components/ILIAS/Help/classes/class.ilHelpUITextRetriever.php:39 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/Help/classes/class.ilHelpUITextRetriever.php on line 39