Linker error - VS2005 thinks it's a function declaration?

Base base;
BaseWrap& baseWrap(reinterpret_cast<BaseWrap&>(base));
boost::python::object obj(boost::shared_ptr<BaseWrap>(&baseWrap)); //
Compile error

Results in this error:

1>PythonPassReference.obj : error LNK2019: unresolved external symbol
"class boost::python::api::object __cdecl obj(class
boost::shared_ptr<struct BaseWrap> &)" (?obj@@YA?
AVobject@api@python@boost@@AAV?$shared_ptr@UBaseWrap@@@4@@Z)
referenced in function _main

My first thought is somehow that looks like a function declaration
instead of creating an object on the stack and instantiating it. If I
remove the shared_ptr, the error goes away.

In case it helps, here's a few more details.

boost::python::object has the following constructor:

      // explicit conversion from any C++ object to Python
      template <class T>
      explicit object(
          T const& x
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
          // use some SFINAE to un-confuse MSVC about its
          // copy-initialization ambiguity claim.
        , typename mpl::if_<is_proxy<T>,int&,int>::type* = 0
# endif
      )
        : object_base(object_base_initializer(x))
      {
      }

boost::shared_ptr<T> has the following constructor:

    template<class Y>
    explicit shared_ptr( Y * p ): px( p ), pn( p ) // Y must be
complete
    {
        boost::detail::sp_enable_shared_from_this( pn, p, p );
    }

Any tips on how to solve this would be greatly appreciated. I'm
probably overlooking something obvious.

Thanks in advance,

Lawrence