It's going to pretty hard to help if that's the only error message. If that's truly the only message, then I suspect there's a Python problem on your system.
Have you been able to unpack any kindlebooks successfully with KindleUnpack before?
1) make sure you're using the very latest version on Kindleunpack (first post in this thread)
2) check the "Dump Mode" box to enable as much output as possible.
3) make sure the mobi in question hasn't had its metadata altered by other scripts. There are some out there that can damage a kindlebook under the guise of "extra cleaning."
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