So I have been working on this little figure of Garfield for a bit now. I got everything looking good but when I went to rig it, and parent it I got an error. That error was due to this intersecting mesh I have with his hand.
You can undo it by separating things by selection in edit mode, but I would advise joining the hand to the arm at the mesh level. I am not a rigger, but I would thing that the rig is confused on how to map the influence of the bones to the meshes at the intersection.