Still having problems

[Havok]

I cant figure it out, I swear its somthing to do with when I add the house addon's from weissvulf's website, when I dont add any addons to SoM it looks fine, the "green grass" texture isnt black, but as soon as I add those house addons, the ground around the outside floor is invisible like the grass texture there isnt right then it mess's up the other grass texture to look all black for me..