Vray Blender 2.68 64 bit problem

i installed Vray Blender 2.68 64bit and also installed the Vray standalone 2.0
when i render it shows a black render why ?
how to fix it ?

Moved from “General Forums > Blender and CG Discussions” to “Support > Lighting and Rendering”

maybe a bit late, but run blender from terminal then you see what the error is…