Shader error help

I'm trying to check my textures in the viewer but I get a "No texmap defined for stage 1/2" error when exporting gmt with Road Shader Two Diffuse Maps shader. I have a texture assigned for stage 1 and 2. Do I have to assign a texture for all stages for it to work?

I don't get this error if using a simple T1 shader.

 

Ahh ok. Seems I answered my own question. All stages need to have a texture assigned.