Hey! I'm sorry, unfortunately that's a known issue. Basically, .31 was an early-access type of thing I didn't
really intend to make widely available. Mainly because it didn't have all the variables programmed, and it was missing one of Viola's potential scenes. This is why I usually tell people to start a new game from the end of the previous chapter, if I publish a substantial update. All those variables are designed to trigger at the start of each chapter, so by loading a save created in a version that
didn't have those variables at the beginning, you wind up with an error like yours when you eventually get to a place where the script expects to find a variable, and it's not there.
For best results, I'll always advise people to wait for the official/public/final version of each chapter, before creating a bunch of saves. Anything prior to the official/public release should be viewed as kind of a (likely broke) Beta version. Sorry about that!
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Hilarious coincidence - in my earliest attempt at a VN (built in Twine with hand-drawn illustrations) one of the girls was naked Micki, and was basically a proto-Nicki. I'll have to see if I can find that art on a flash drive somewhere..