Maya 2018 Arnold AO Bake Issues??

Hi everyone,

I'm trying to bake AO off a high poly object for my low poly version but I'm having issues baking using Arnold. Several areas of my object during the render get blacked out, I'm not sure what I'm doing wrong.

My current workflow to bake AO is: Hypershade- Arnold- Shader- Surface- Ai Ambient Occlusion- Assign material to selection- Arnold Utilities- Render Selection to Texture.

I also tried an AO Bake of a simple Low Poly version of another object and that gave me a Black screen entirely. 

I've UVed all the objects in the scene so I'm not sure what could be causing the problem.

Here's images of the issue I'm having. 

Please let me know your solution to this issue.

Thanks in advance!