luabind with boost::signals error

Hi,

I am trying to use luabind::object as a slot for boost::signal.

This code is perfectly fine:

  boost::signal<void(const std::string&)> sig;

  luabind::object slot = globals(lua)["slot"];

  sig.connect(slot);

  sig("signal call");

but a call to:

 sig.disconnect(slot);

throws a std::runtime_error("Trying to use unregistered class");

call stack:

 	KernelBase.dll!7717b727() 	
 	[Frames below may be incorrect and/or missing, no symbols loaded for
KernelBase.dll]
 	KernelBase.dll!7717b727() 	
 	msvcr90d.dll!_CxxThrowException(void * pExceptionObject=0x0020ece4,
const _s__ThrowInfo * pThrowInfo=0x00e18090)  Line 161	C++
>	playground.exe!luabind::detail::make_instance<std::auto_ptr<boost::function<void __cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &)> > >(lua_State * L=0x000c01c0, std::auto_ptr<boost::function<void __cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char> > const &)> > p=auto_ptr {...})  Line 80 + 0x41 bytes	C++
 	playground.exe!luabind::detail::make_pointee_instance<boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> >(lua_State * L=0x000c01c0, boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> & x={...}, boost::mpl::bool_<0> __formal={...},
boost::mpl::bool_<0> __formal={...})  Line 183 + 0x21 bytes	C++
 	playground.exe!luabind::detail::make_pointee_instance<boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)>,boost::mpl::bool_<1> >(lua_State * L=0x000c01c0,
boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> & x={...}, boost::mpl::bool_<1> __formal={...})  Line 195
+ 0x25 bytes	C++
 	playground.exe!luabind::detail::value_converter::apply<boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> >(lua_State * L=0x000c01c0, boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> x={...})  Line 281 + 0x1d bytes	C++
 	playground.exe!luabind::detail::push_aux<boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> const ,luabind::detail::default_policy>(lua_State *
interpreter=0x000c01c0, const boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> & value={...}, luabind::detail::default_policy *
__formal=0x00000000)  Line 73	C++
 	playground.exe!luabind::detail::push<boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> const ,luabind::detail::null_type>(lua_State *
interpreter=0x000c01c0, const boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> & value={...}, const luabind::detail::null_type &
__formal={...})  Line 83 + 0xf bytes	C++
 	playground.exe!luabind::detail::push<boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> const >(lua_State * interpreter=0x000c01c0, const
boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> & value={...})  Line 89 + 0x1c bytes	C++
 	playground.exe!luabind::adl::operator==<boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)>,luabind::adl::object>(const boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> & lhs={...}, const luabind::adl::object & rhs={...})  Line
214 + 0xc9 bytes	C++
 	playground.exe!boost::signal1<void,std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &,boost::last_value<void>,int,std::less<int>,boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> >::do_disconnect<luabind::adl::object>(const
luabind::adl::object & f={...}, boost::mpl::bool_<0> __formal={...})
Line 242 + 0xd bytes	C++
 	playground.exe!boost::signal1<void,std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &,boost::last_value<void>,int,std::less<int>,boost::function<void
__cdecl(std::basic_string<char,std::char_traits<char>,std::allocator<char>
> const &)> >::disconnect<luabind::adl::object>(const
luabind::adl::object & t={...})  Line 225	C++
 	playground.exe!main()  Line 144	C++
 	playground.exe!__tmainCRTStartup()  Line 586 + 0x19 bytes	C
 	playground.exe!mainCRTStartup()  Line 403	C
 	kernel32.dll!759f3677() 	
 	ntdll.dll!77a89f02() 	
 	ntdll.dll!77a89ed5()

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