First question... What version of ozpost are you using? (please let me know, even though the following suggestion will probably fix this issue for you).
Suggestion for probable fix:
Go to your configuration settings -> shipping/packaging and set your Postal Code.
Then try installing the ozpost module again.
The error you are getting *shouldn't* be happening, because if the postcode isn't set the module should be using a default value of "9999" .. for some reason it appears that you don't have a valid postcode set, and the module isn't correctly detecting this fact, so it is trying to set a value of 'NONE' in a place where NONE isn't allowed.
This was a 'bug' that I noticed in the code a few versions back, which is why I added code to set a default value if the postcode wasn't already set, which is why I'm interested in know what version you are using.. If the current version then I need to take another look at the code, if an older version then I don't need to worry about it any longer.
Cheers
Rod
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