I wouldn't worry about that file, the randomizer doesn't actually touch any of the My Castle maps, so it doesn't matter if you cannot decompress that one.Um so i just noticed that CY02 didn't and can't be decompressed. I am assuming this is what is causing my problem, but i don't know what to do from here
A couple of people have encountered an issue where the randomizer encounters an error and stops before completely randomizing everything. I'm still trying to reproduce the error, so I don't have any immediate solution to the issue. My only suggestion would be to try what others did and build the folder you are going to randomize from scratch, though I can't guarantee that this will fix the freezing.