It is unlikely to be related to the 002 area code, but more likely one of the earlier options you have chosen. E.g. Did you accidentally choose "aerial" instead of "cable"?
I realise the nztivo site is down, but some basic instructions can be found at:
http://forums.oztivo.net/showthread.php?t=959.
If you still have trouble, can you please post what you have entered for each step up until the error. (It's hard to help as I have no idea if you are you setting it up for sky or FTA, which postcode you are using etc etc...)
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