Hi

Import a Small or other Size Block then the error message " Map has noch Geometry" is away!!!
If u want to apply the Texture on the Terrain u must make it in the MED !
(View/Skins then Import SKin image)

I Hope u understand this post

cu Angel

Tutorials:
[Blender]Terrain creation ENG/GER
[Blender]Low Poly Tree Modeling
[GIMP]Create a Texture for Terrains
CLICK HERE