The copy to notepad option doesn’t work. A Windows 10 issue, possibly. I’ll upload the photo from Steam here.
The Mason won’t build, but only restocks after the error, as before. Never used debug and no mods, vanilla game.
I am seeing at least 1 mod being used
I think they mean no mods other than ACE / consider ACE vanilla 
I think it might be related to the recipes that just got unlocked? Not sure. If the recipes just got unlocked, it means the Mason also just returned from the trip it was - so maybe it was some sort of interruption of their activities or bad state when they left