So, I decided to make an attic and add a third floor to my house. I crafted the door and placed it and then I got an error message - [UncaughtErrorEvent type="uncaughtError" bubbles=true cancelable=true eventPhase=2]
This pops up now whenever I enter the house from the garden.
Also on a side note, I can't seem to get the Giant Lover achievement even though I got and iconized all the emblems myself (no auctions involved). I double checked, all 11 icons are different.
EDIT - for some reason the error message seems to have stopped popping up after I donated a couple of wall segments to the project