IGES Down

I trying to read IGES File.
But Program down during execution. Here My code to read Iges. and Down Position.
IGES Made by UG.
Help me. thank you

IGESControl_Reader Reader;
Standard_Integer status = Reader.ReadFile(aFileName);
Standard_Boolean failsonly = Standard_False;

if (status != IFSelect_RetDone) return status;

Reader.Check(Standard_True);

IFSelect_PrintCount mode = IFSelect_ItemsByEntity;
Reader.PrintCheckLoad(failsonly, mode);

// IFSelect_RetVoid,
// IFSelect_RetDone,
// IFSelect_RetError,
// IFSelect_RetFail,
// IFSelect_RetStop

Handle(TColStd_HSequenceOfTransient) myAllFace,myVisFace;
myAllFace = Reader.GiveList("iges-faces");
myVisFace = Reader.GiveList("iges-vigible-roots", myAllFace);

Standard_Integer i, nb = myVisFace->Length();
for(i=1;i Handle(Standard_Transient) ent = myVisFace->Value(i);
Standard_Boolean ok = Reader.TransferEntity(ent); ==> Here Down.....
// Standard_Boolean ok = Reader.TransferOne(i);
}

TopoDS_Shape aShape = Reader.OneShape();
aHSequenceOfShape->Append(aShape);

return status;