Lightmaps/shadow beginners problem

hi guys, I am quite new with UE. IV got problem with nasty black spots on my textures/geometry. I tried uv with big paddings, I let ue to generate the uv maps, I tried production Lightmaps settings but I have still the same problem. any clue why is it happening? the for help

Hard to tell what the issue may be without screenshots.

here is the screenshot

Your lightmap is too low resolution, shadows are bleeding onto other areas. You can also improve the result by adjusting the model so that there’s no overlapping faces

resolution is 2048 and on second uv sets for Lightmap i have no overlapping faces, more ideas please

or am I wrong and first uv set is for Lightmaps?