When one creates a room and lays to add floors, this is created on the inner perimeter of the floor. This generates an error that leaves the floor spaces in the doors empty, without floor. In architecture the correct thing is that the mosaics of the floors reach half of the space of the door, that is to say, half of the walls, so that the space of the doors is not emptied until the continuous room. The perimeter of the floor should reach half of the walls.