neural convert to OpenFoam Error

Dear Sir/Madam,

Hi, I am currently trying to experiment with Netgen. I have managed to generate the mesh on the carotid artery and export it into neural format. I am thinking to convert it to FOAM, so I use the command netgenNeutralToFoa, however, everytime I try this command, it always showed me the error below. is there anyway I can fix it in Netgen?

--> FOAM FATAL ERROR:
face 0 in patch 1 does not have neighbour cell face: 3(7298 7432 7044)

From function Foam::labelList Foam::polyMesh::facePatchFaceCells(const faceList&, const labelListList&, const faceListList&, Foam::label) const
in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 118.

FOAM aborting

#0 Foam::error::printStack(Foam::Ostream&) at ??
#1 Foam::error::abort() at ??
#2 Foam::polyMesh::facePatchFaceCells(Foam::List<Foam::face> const&, Foam::List<Foam::List<int> > const&, Foam::List<Foam::List<Foam::face> > const&, int) const at ??
#3 Foam::polyMesh::setTopology(Foam::List<Foam::cellShape> const&, Foam::List<Foam::List<Foam::face> > const&, Foam::List<Foam::word> const&, Foam::List<int>&, Foam::List<int>&, int&, int&, Foam::List<Foam::cell>&) at ??
#4 Foam::polyMesh::polyMesh(Foam::IOobject const&, Foam::Xfer<Foam::Field<Foam::Vector<double> > > const&, Foam::List<Foam::cellShape> const&, Foam::List<Foam::List<Foam::face> > const&, Foam::List<Foam::word> const&, Foam::List<Foam::word> const&, Foam::word const&, Foam::word const&, Foam::List<Foam::word> const&, bool) at ??
#5 ? at ??
#6 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#7 ? at ??
Aborted (core dumped)
sethu@sethu-VM:~/OpenFOAM/sethu-5.0/run/Netgen$

Sorry this is not a function of netgen, but of openFOAM. Maybe the community there can help. If the netgen mesh is corrupt, maybe you create a small test case where Netgen creates such corrupt meshes?
Best
Christopher