Comment 7 for bug 908917

(Sorry, I've enjoyed winter vacation)

On Ubuntu the only required additional library is python-usb, but you seem to have that installed. I can only guess then that ACR122U207 is different enough from a ACR122U203 to produce the error.

I've posted the script ccid-nfc.py to http://pastebin.com/gAXFcdzV which I used initially to learn the behaviour of ACR122U. Maybe you could play around with that, I guess you have sufficient programming skills to enable test sections in the script. You will need to copy it into your /home/../Development/ directory.