No static implementation of tsp_tour

File "/usr/lib/python2.7/dist-packages/graph_tool/topology/__init__.py", line 2140, in tsp_tour
    get_tsp(g._Graph__graph, int(src), _prop("e", g, weight))

RuntimeError: No static implementation was found for the desired routine. This is a graph_tool bug. :-( Please submit a bug report at http://graph-tool.skewed.de/issues. What follows is debug information.

Action: std::_Bind<get_tsp_approx (std::_Placeholder<1>, unsigned long, std::_Placeholder<2>, std::reference_wrapper<std::vector<int, std::allocator<int> > >)>

Arg 1: std::reference_wrapper<boost::adj_list<unsigned long> >

Arg 2: graph_tool::UnityPropertyMap<unsigned long, boost::adj_list<unsigned long>::edge_descriptor>