call_function causes my program to crash

I've successfully used call_function to call Lua functions before and didn't
have a problem. I think it's because they were of global scope like:int sum
= luabind::call_function<int>( L, "add", 2, 3 );

but the one I'm trying to do now is like this, with a different scope:
luabind::call_function<void>( L, "CNPC_Nurse:Update" );

-- Here's the Lua code that I'm trying to call (in a different file from the
C++, of course)
function CNPC_Nurse:Update()
Msg( "\nIn Nurse:Update" )
end

// these came earlier in the file as the above C++ code
luabind::module( L ) [
luabind::class_<CNPC_Nurse>( "CNPC_Nurse" )
];

When I run it, it crashes the application without a message. I've narrowed
it down to the call_function line causes the problem. Any idea why the
"CNPC_Nurse:Update" call breaks it?

Thanks :)

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