Heightmap file has an invalid size(possiblynot 16bit)

I’ve tried everything possible in world machine, but UE4 won’t accept the texture…

Tried 8k, 2k, and specifically build the textures at 2017x2017… UE4 Still wont accept the textures, even though it should work.

http://puu.sh/kK0U9/0932deb29e.png

http://puu.sh/kK1rV/3f1efaf557.png

http://puu.sh/kK18Y/ef9ea6dc5b.jpg

Did the same thing over and over, then it randomly worked… Should have worked from the start…

I got exactly same problem now , do you know how to repair ?