Empty patch trouble
 

Hello,
I am new to CFD and OpenFoam. I am using Netgen 4.9.13 (Windows) as a mesh generator and exporting directly into OpenFoam format (1.7.0). In Netgen I give similar faces the same boundary condition number, then I redefine them in the boundary file. Whenever I define a patch as "empty" the solver crashes. It gives the error, "This mesh contains patches of type empty but is not 1D or 2D by virtue of the fact that the number of faces of this empty patch is not divisible by the number of cells." If I define the patch as "wall" it can work, but that's not a good solution, as they are really not walls. Any suggestions?
Thanks,
Troy