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i got that error after i prepared a key and saved the key file and tried to prepare the same key once more. but you can use first file without problem....
I have this issue with really cheap Chinese keys. Hitag pro battles to read the key data from these keys properly and key appears to be locked for programming. Using better quality keys solves this issue. That being said, these cheap keys work fine in other key programmer, so it looks like Hitag pro is more sensitive to type of keys.