I had created a simple house and had saved it, I had already placed a couple of them and the Hearthlings build them just fine, went to place the same house again and this happens:
The error windows keep popping up until the game closes, there was no in game error popup to capture, had to capture whole screen (Prt Scr to Paint) to show
I have the templates, it’s a random thing when that happens though (still will once in awhile), have added couple other simple ones and can happen on any one of them, very random