Fatal error: Uncaught Error: Interface "ILIAS\UI\HelpTextRetriever" not found in /var/www/html/ilias/components/ILIAS/UI/src/Help/TextRetriever/Echoing.php:30 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/UI/src/Help/TextRetriever/Echoing.php on line 30