Hi! when i import a 3ds file in dialux, walls are missing. In Max all are fine, and is not only this file, i get this error many time from diffrent 3ds file. 3ds file is:

i don't use MAX, is any tricks to save 3ds file so i don't have this error, if it is please let me know so i can tell people that help me with 3ds file, THanks!