Not sure if this is a bug or not but I think its something that should be corrected regardless.
The household limit for the game is 8 but the game will not let me create or add a plumbot to my household of 7, which I think is ridiculous. Its like the game is reading my household as full at 7 sims (including plumbots)when that isn't the case. I can understand it not letting you add one if you have 8 sims in the household but that isn't the case; for plumbots it cuts you off at 7 and that is irritating.
And no I'm not using one of those NRAAS controller mods; I heard that one wasn't even updated to let plumbots be added when having 8 already in the household.
EDIT:
Never mind, I figured out what the problem was. Someone can delete this message.