Weird Log Errors

[anonymous_user_99aa1f50]

so i get this weird log errors when i rebuild lightning with a static mesh imported on the scene so why is this happening?

this is the picture:

and also in the 3d program which is blender i make 2nd uv channel for lightmap with margin island of 1
so how is to solve this?

[anonymous_user_923c79df]

Click onto the mesh - go to the properties on the right side of the window - check if the mesh appears in the mesh slot

For the light error -> go into the mesh settings (double click onto it in the content browser) and at the lightmapcoordinateindex you have to type in 1

[anonymous_user_99aa1f50]

Thanks for the solution