Meshing Error

Hi,

I'm trying to run a 3D fluid simulation. When the geometery is simple, everything runs fine. As soon as I add an angled rectange, it gives me the following error:

      Failed to create boundry layer mesh. 
      Mesh is incorrect. 
      -Detail: Domain element has wrong number of neighbors. 

I have attached the file I'm working work. Any help would be appreciated.

Thanks!