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Was this a new or existing save? And any other mods installed? Finally, have you reinstalled the mod and/or double checked the install steps or video? That includes deleting the backups folder, as it looks like your Mansion.gd is acting like the farm’s variables aren’t a thing (ie: vanilla code) in your globals & farm file.

(+1)

Existing save - which turns out to have been the problem, as revelealed by fsadfasdfasdfasfdaaa's excellent sleuthing :P

Excellent! Unfortunately it looks like a few of the backwards compatibility aspects may not be able to apply automatically on existing saves (or at least how I have been doing it, hopefully there's another way to).