Dijkstra code2

---CODE---
typedef long Weight;
typedef property<edge_weight_t, Weight> EdgeWeightProperty;
typedef boost::adjacency_list<listS, vecS, directedS, allow_parallel_edge_tag, EdgeWeightProperty> Graph;
typedef boost::graph_traits<Graph>::vertex_descriptor Vertex;
typedef boost::graph_traits<Graph>::vertex_iterator VertexIterator;
typedef boost::graph_traits<Graph>::edge_descriptor Edge;
typedef boost::property_map<Graph, boost::vertex_index_t>::type IndexMap;

typedef boost::property_map<Graph, boost::vertex_name_t>::type NameMap; // This line causes an error

---ERROR---
In file included from /usr/include/boost/graph/adjacency_list.hpp:246:0,
                 from north.cpp:8:
/usr/include/boost/graph/detail/adjacency_list.hpp: In instantiation of 'struct b
oost::vec_adj_list_any_vertex_pa::bind_<boost::vertex_name_t, boost::adjacency_li
st<boost::listS, boost::vecS, boost::directedS, boost::allow_parallel_edge_tag, b
oost::property<boost::edge_weight_t, long int> >, boost::allow_parallel_edge_tag>
':
/usr/include/boost/graph/detail/adjacency_list.hpp:2591:12:   required from 'stru
ct boost::detail::vec_adj_list_choose_vertex_pa<boost::vertex_name_t, boost::adja
cency_list<boost::listS, boost::vecS, boost::directedS, boost::allow_parallel_edg
e_tag, boost::property<boost::edge_weight_t, long int> >, boost::allow_parallel_e
dge_tag>'
/usr/include/boost/graph/detail/adjacency_list.hpp:2717:12:   required from 'stru
ct boost::vec_adj_list_vertex_property_selector::bind_<boost::adjacency_list<boos
t::listS, boost::vecS, boost::directedS, boost::allow_parallel_edge_tag, boost::p
roperty<boost::edge_weight_t, long int> >, boost::allow_parallel_edge_tag, boost:
:vertex_name_t>'
/usr/include/boost/graph/properties.hpp:217:12:   required from 'struct boost::de
tail::vertex_property_map<boost::adjacency_list<boost::listS, boost::vecS, boost:
:directedS, boost::allow_parallel_edge_tag, boost::property<boost::edge_weight_t,
 long int> >, boost::vertex_name_t>'
/usr/include/boost/graph/properties.hpp:228:10:   required from 'struct boost::pr
operty_map<boost::adjacency_list<boost::listS, boost::vecS, boost::directedS, boo
st::allow_parallel_edge_tag, boost::property<boost::edge_weight_t, long int> >, b
oost::vertex_name_t>'
north.cpp:76:57:   required from here
/usr/include/boost/graph/detail/adjacency_list.hpp:2540:29: error: forming refere
nce to void
         typedef value_type& reference;
                             ^
/usr/include/boost/graph/detail/adjacency_list.hpp:2541:35: error: forming refere
nce to void
         typedef const value_type& const_reference;
                                   ^
/usr/include/boost/graph/detail/adjacency_list.hpp:2544:55: error: forming refere
nce to void
           <Graph, Graph*, value_type, reference, Tag> type;
                                                       ^
/usr/include/boost/graph/detail/adjacency_list.hpp:2546:67: error: forming refere
nce to void
           <Graph, const Graph*, value_type, const_reference, Tag> const_type;
                                                                   ^