Problem Overloading Function

I've successfully bound an overloaded function before but this one is giving
errors.
It's of the CAI_BaseNPC class. The function I'm trying to bind is the top
one here.
CAI_Motor * GetMotor() { return m_pMotor; }
const CAI_Motor * GetMotor() const { return m_pMotor; }

I thought maybe it was because of missing includes or something so I put
them in. Here's the code that generates the error.
#include "ai_basenpc.h"
#include "ai_motor.h"
class CAI_Motor;
....
.def( "KeyValue", (bool(CBaseEntity::*)(const char*, const char*))
&CBaseEntity::KeyValue ) // overloaded fine
.def( "GetMotor", (CAI_Motor( CAI_BaseNPC::* )(void)) &CAI_BaseNPC::GetMotor
) // generates error

There are quite a few erro messages but they're all pretty much the same
after the second one.. These are the first two.
error C2440: 'type cast' : cannot convert from 'overloaded-function' to
'CAI_Motor (__thiscall CAI_BaseNPC::* )(void)'
1>        None of the functions with this name in scope match the target
type
1>.\lua_luahandle.cpp(171) : error C2780: 'luabind::class_<T>
&luabind::class_<T>::def(luabind::detail::operator_<Derived>)' : expects 1
arguments - 2 provided
1>        with
1>        [
1>            T=CAI_BaseNPC
1>        ]
1>        c:\HL2AITools02\src\lua\luabind-0.8.1\luabind/class.hpp(1207) :
see declaration of 'luabind::class_<T>::def'
1>        with
1>        [
1>            T=CAI_BaseNPC
1>        ]

Any ideas? Thanks.

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