Displaying Composer at control points/renderers

[samnorthernlights]

Hi. I know that tagCustom was removed from Minimserver 2 and replaced by upnpCustom. I have tried to use this like I did in previous versions of Minimserver to display composers instead of artists at control points etc, but when I add Composer.displayRole{artist} to this new property I just get an error message and cannot restart Minimserver. Any ideas what I'm doing wrong? Thanks.