[MOD RELATED] Can't assign rooms to different units

So, I just finished downloading the For Rent EP and the main feature is not working???

I built townhouses a couple days ago for the pack, and when I load the lot and change the lot type to residential rental, it doesn't let me assign units. Like, if i click on a room, it won't let me choose which unit I want it to be.

I also tried it on an empty lot and it's doing the same thing.