Hi. I get this message about my landscape … I can not find the light index for the landscape…
MapCheck: Error: Landscape_0 Component is a static type but has invalid lightmap settings! Indirect lighting will be black. Common causes are lightmap resolution of 0, LightmapCoordinateIndex
Your concern sounds very daunting but fortunately, there is a fix. You will need to do a little bit of digging for any empty static meshes and then fill them with a value. The answer is provided by a very knowledgeable hero named Luos. I have provided the link to their answer as it seems applicable to your situation.
You may check Lanscape components. You can select them in Manage Mode. One Landscape can have a lot of them.
But the only setting for Landscape Lighmap I know is under landscape itself: