I'm trying to retrieve all the nodes of a graph that belong to a specific type. I use the find_vertex for this: referents = find_vertex(graph, graph.vertex_properties['type'], 'referent') But all I get is this error: File "/usr/lib/python2.7/dist-packages/graph_tool/util/__init__.py", line 58, in find_vertex (val, val)) TypeError: No registered converter was able to extract a C++ reference to type graph_tool::GraphInterface from this Python object of type Graph. Any clue of what is the problem? -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.