Fatal error: Uncaught Error: Class "ilMMAbstractBaseTypeHandlerAction" not found in /var/www/html/ilias/components/ILIAS/MainMenu/classes/TypeHandler/class.ilMMTypeHandlerLink.php:15 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/MainMenu/classes/TypeHandler/class.ilMMTypeHandlerLink.php on line 15