problem on using shared_ptr

i have a class which uses shared_ptr:

class Entity:public boost::enable_shared_from_this<Entity>
{
public:
  typedef boost::shared_ptr<Entity> Ptr;
...
...
}

and i registed it like this:

 module(context,"sys")
  [
  class_<Entity,Entity::Ptr>("Entity")
 ...
 ...
  ];


and also i have a little script as:

function ProcessUpdate(sender)
  prient("update!");
end


now i pass a Entity::Ptr as a parameter to a lua function:

void Server::LuaLogic::ProcessUpdate( Entity::Ptr sender )
{
  _mutContext.lock();
  lua_State *l = _l->Lock();
  int idx=lua_gettop(l);

  try
  {
    luabind::object pu = luabind::globals(l)["ProcessUpdate"];

    if(luabind::type(pu)==LUA_TFUNCTION)
    {
     pu(sender);
    }
  }
 catch (luabind::error* e)
 {
    const char* what = e->what();
 }

lua_settop(l,idx);

 _l->Unlock();
 _mutContext.unlock();
}


and after(or during) the "pu(sender);",my debuger noticed me a
luabind::error,in object.hpp at line 1156,and i can`t catch it at all so i
don`t understand what happend.

any help please?

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