I have the same error when I use the all too popular boolprop cheat. On saturdays if boolprop is on the Landlords party will set off errors.  I don't care about the parties, so I hit delete and the landlord leaves. Not a major problem.

It's an apartment block I made. For sims that were all born in the game from sims I created.

On the weird side though, even after turning off boolprop since apartments. You can still slide motives around.