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Lightmass crashed and generated lightmap

Lightmass crashed when building lighting.

I'm attaching a Lightmap of object from Blender. When importing I've set Generate lightmap but there is nothing there. I've selected UV channel 1 where lightmap is.

Why is lightmap not generated ?

alt text

alt text

Product Version: UE 4.19
lmas1.jpg (77.6 kB)
light2.jpg (141.4 kB)
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asked Mar 19 '18 at 12:34 AM in Using UE4

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