Just had a person stop over for a tune today. Got his file and went to license the car, I got a Invalid VIN/OS pair. He has a ZZP tune. I'm unable to license it. So I did some reading. It seems this error has popped up on the HPT support forum before, and I saw ZZP tune mentioned as well. After talking to another friend, boostedponty here. He said the PCM is from a 99 and it'* flashed to a 98 GTP. The VIN on the PCM does not match the operating system in the PCM So can not be licensed. I can send the file in to HPT and have it fixed. Or, have the PCM reflashed with a tech2, then start over. Or, lucky for me. The person had his stock PCM in the trunk. I just need to plug it in to my car so I can read it, then do a from scratch tune. Sucks but looks like my only option here. I know we only have a few tuners here, but I'm sure this error will show up sooner or later. This thread will provide information for the next person.