Thank you so much. I tried both of your suggestions, but now when I run the program, it shows the following error: /home/narges/miniconda3/lib/python3.7/site-packages/graph_tool/draw/cairo_draw.py:1494: RuntimeWarning: Error importing Gtk module: No module named 'gi'; GTK+ drawing will not work. warnings.warn(msg, RuntimeWarning) Traceback (most recent call last): File "GirvanIgraph.py", line 18, in <module> igraph_graph = pyintergraph.gt2igraph(graph_tool_graph, labelname="node_label") File "/home/narges/miniconda3/lib/python3.7/site-packages/pyintergraph/funcs.py", line 17, in gt2igraph return G.to_igraph() File "/home/narges/miniconda3/lib/python3.7/site-packages/pyintergraph/Graph.py", line 289, in to_igraph iG.vs[i].update_attributes(name=self.node_labels[node], **attr) TypeError: update_attributes() got multiple values for keyword argument 'name' -- Sent from: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/