Landscape texture coming up black

ok so I made a texture using this tutorial “Texturing a Landscape in UE4 (Unreal Engine 4) - YouTube
I finished the layer but every time I apply the texture to landscape material my landscape turns completely black and I cant see anything. I know it it there but it just disappears and I don’t understand this program enough to even begin to fathom this solution. “https://answers.unrealengine.com/questions/89605/texture-turns-dark-in-viewport-and-after-building.html

This is before the texture.

This is after applying the texture

been almost 2 hours and still no help.
Is this site dead?

let me give a little update then I can not figure this out. and Im coming to the conclusion that the landscapelayerblend node is broken.