Cubes Custom Material problem

Hello everyone, I’m trying out Cubes plugin and it is very nice so far, however I am unable to properly set Lighting material for it with normal maps. When I set UseMaterialColors to false I can see very dark terrain, when I set it to true I can’t see anything at all.

Please help!

maybe this will help you :

I’m doing as it says.
When I try to apply to separate cube outside of Cubes library I get this: