[C++-sig] why am I getting a Boost.Python.ArgumentError?

When trying to called a wrapped method (getName) from python, I get the following error: return self.geometry.getName() Boost.Python.ArgumentError: Python argument types in Geometry.getName(Geometry) did not match C++ signature: getName(gfx::Geometry {lvalue}) I don't understand why these don't match, though. It seems to say that the C++ signature is Geometry::getName() (which is true) ... and that's how I'm calling it from python. If I "print self.geometry" I get that it is a gfx.Geometry object. Thanks for your help. -tom