Debug simple voxel engine bugs

I need you to debug a extremely simple voxel engine I did. I have a bug while compiling the geometry shader with GPU shader analyser application. The source code is from another written with OpenGL, I'll send you the the link soon.

I want you to study the way to extend this engine and to study a little more about voxel engine. I don't want to make mistakes and to correct them later.

En fait je suis français mais j'ai aussi posté le job dans un autre site.