I don't really know what happened. I suspect some weird behavior between the rpy and rpyc files, but it's impossible to know entirely for sure. If others report similar issues, I'll have to investigate more.Did so. Worked. only after i'd deleted the folder myself and began a game so I can only assume the mod expects a started save file, and kicks a fit when there isn't one.
My mod does not look for saves and doesn't affect them directly. Its only known side-effect is that if uninstalled, saves made with the mod will have an error (my post covers this. Just ignore or rollback until it stops appearing to clear the issue) but you saw something different.
Glad it did end up working out in the end.