Hi Tom
Do you have a Pi 2, or Pi B+ ?
This error indicates it is a Pi 2, which should never have worked, all I did was add the check to see what the hardware was.
What I really want to know, if you had this working on a Pi 2, how did you manage that ?
The main issue has been the configuration of the WiFi dongle, so if you had this working it would lead me to believe that you are using a different WiFi dongle
I am really intrigued how you had this working on a Pi 2
I can probably turn this error to a warning, which would get you working again.
Thx
Lee