Fatal error: Uncaught Error: Class "ilButton" not found in /var/www/html/ilias/components/ILIAS/UIComponent/Button/classes/class.ilJsLinkButton.php:24 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/UIComponent/Button/classes/class.ilJsLinkButton.php on line 24