Time dependent adaptive mesh refinement

Hi
I'm trying to make a CFD model where the flow is driven by the motion of the walls.
To do so I coupled a moving mesh and a laminar flow model. First I solved a simple geometry using 2D axial symmetry, and I used adaptive mesh refinement and got a solution.
When I moved on to a 3D geometry, however, I get this error:
"Cannot handle this hex and prism configuration.
- Detail: Topology has loops that can not be resolved. "

What does this mean and how can I solve this?
Thanks a lot
Hemi