No objects or images found to bake to... again I've read though many threads related to this and I've yet to find one that works for me.

I have a single object that I originally baked some AO to.  Days later I want to go back and rebake it.  The only problem is, no matter what I do, it won't work and gives me the error every time.

I've made sure the object is selected and the render (camera) icon is ON.  I'm using the standard Blender Render method.  

I've attached my scene and left it right to the point to where you should be able to click "Bake".  Can someone please tell me what I'm doing wrong??  I really don't want any "hack" related answer and am desperate to know the exact issue.

Attached Object

Thanks,
-jeff
Baking started to work when I set Duplication to None (in Properties -> Object tab).