I had a similar problem with exactly the same messages. I presumed that the network was not working because of the message. I contacted Mikael from AC Ryan and he was very helpful indeed and suggested turning on the NAS in the setup. I did that and the AC Ryan was seen immediately on the network. I also checked the Internet Radio and it all worked fine. Perhaps AC Ryan might like to have a look at the messages that you get when attempting to set up the network as it did seem to be confusing.
Thanks for the help and sorry again to be an idiot but where is that in the Setup? As i said i was thrown that i couldn't seen any 'Extensions info' in the menu.