Messages - invalid light settings - NULL static mesh property

I have imported eight houses from Sketchup to eight different maps. Each house is a lot of groups. I have imported the houses without combining the meshes so I will have good lightmaps.

I have done a LightMass Importance Volume around all the houses. After building the light I get a lot of error messages!
Like - invalid light settings - NULL static mesh property
What to do?
Hope for some help - perhaps some tutorial to learn from?

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