Black Texture when baking Ambient Occlusion with Blender internals? In my blender file, I have a simple castle in which when I try baking the Ambient Occlusion it generated a black texture. How can I get Blender to bake correctly instead of this black texture? 

I been reading on forums about this problem which mentioned about inverted normals but my normals or overlapping UV but I generated another without overlapping UV's and received the same problem. They also being negatively scaled but this model has positive scales ;( 

Thanks in advance!

Blender file attached here:
Try to set Environment Lighting to 1.0 in the World tab.
I have tested it now and it bakes AO correctly then.
The funny thing is that you dont need to check the Environment Lighting checkbox and it still makes the change.