Lightmap issue

Hello guys. This is my first post and i am new in UN4.
I have a big model and i setuped a second UV map for lightmap and i set the light map coordinate index to 1, but no matter what, i have a very damaged lightmap. Any idea?
Thanks in advance

Btw my website: [link text][2]

Closing as duplicate of: Lightmap issue - Rendering - Epic Developer Community Forums