"MAC Discovery" error in connecting to UPnP server

I am running OSMC on raspberry pi B+ and I want to connect it to UPnP server . I can find the server which I want to connect , but when I set the directory name and hit “OK” button, “MAC Discovery” error appears on the top of the display.
Are there any fix available?

(sorry for my poor English. My national language is not English… :pensive:)