No matching overload found

I can't understand why luabind is giving me this error. I have a function
bound with:
luabind::module( GetLua() ) [
luabind::class_<CGlobalEntityList>( "CGlobalEntityList" )
.def( "FindEntityByName", ( CBaseEntity *( CGlobalEntityList::* )(
CBaseEntity *, const char *, CBaseEntity *, CBaseEntity *, CBaseEntity *,
IEntityFindFilter * )) &CGlobalEntityList::FindEntityByName )
];


to the function:
// uses default arguments
CBaseEntity *CGlobalEntityList::FindEntityByName( CBaseEntity *pStartEntity,
const char *szName, CBaseEntity *pSearchingEntity, CBaseEntity *pActivator,
CBaseEntity *pCaller, IEntityFindFilter *pFilter )


I have a CGlobalEntityList object called gEntList. I set NULL = 0 at the top
of the file and made sure that it does equal 0. When I call the bound
function using with the code:
gEntList:FindEntityByName( NULL, szName, NULL, NULL, NULL, NULL )


When I run the code, I get the following error:
[Lua-ERR] No matching overload found, candidates:
CBaseEntity* FindEntityByName(CGlobalEntityList&,CBaseEntity*,char
const*,CBaseEntity*,CBaseEntity*,CBaseEntity*,IEntityFindFilter*)

This is really confusing because the first parameter in the message's
function is CGlobalEntityList&. This was not what I defined with LuaBind
earlier and no such function exists to match this definition. Is my binding
code wrong somewhere? Thanks in advance.

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