I’ve got the same error message and whatever I do, device won’t show up in my fritz.box’s WLAN.
Raspberry 3 model B boots very fine with Raspbian OS. Internet, WLAN and Bluetooth no problem.
(Besides, I’ve got a fundamental question: What is the cause for preparing special image files for the software?
Why not install the software on already working OS? It seems like making a boot device for a Windows program like Adobe Photoshop on a Windows machine.)
I have a HiFiBerry on top of the Raspberry and tried several music player images up to now (volumio, runeplayer, max2to, a.s.o). None of them worked up to now.
I doubt that I can ever listen to my equipment…
Rgds from Fritz