If this problem occurs when you even try to open it (so you can't even start to work), you can ignore what I wrote below; maybe you got a bugged version, you could delete it and download it from the tutorial on the Hive where they have a link to it.
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I know it's a stupid question, but are you sure you followed the (very good) tutorials for animtransfer step by step, and that there is nothing wrong with the models you're working with?