Fbx export into UE4 problem!

Hi guys
I want to import a fbx file from 3ds max into UE4, when I import the error says" no smoothing group information was found in this fbx scene " and the model won’t import. what should I do ? I’m new to UE4 and also 3ds max, I checked UE4 and the smoothing group under geometry tab was ticked but it’s not working !

what version of 3ds max is it?

It’s 3ds max 2015