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Weird Log Errors

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:

e80525e88e0d6d51eb39668b0d3ee3f43e21e986.png

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?

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 :slight_smile:

Thanks for the solution