Hello, I got this error when trying to save a graph to a file: Traceback (most recent call last): File "/usr/local/bin/graphanalyze.py", line 123, in <module> network.save(outFN) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/graph_tool/__init__.py", line 1443, in save self.__graph.WriteToFile(file_name, None, fmt, props) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/graph_tool/io.py", line 62, in pickler pickle.dump(obj, sstream, -1) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 1370, in dump Pickler(file, protocol).dump(obj) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 224, in dump self.save(obj) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 600, in save_list self._batch_appends(iter(obj)) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 633, in _batch_appends save(x) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 286, in save f(self, obj) # Call unbound method with explicit self File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 548, in save_tuple save(element) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 306, in save rv = reduce(self.proto) RuntimeError: Pickling of "graph_tool.libgraph_tool_core.Edge" instances is not enabled (http://www.boost.org/libs/python/doc/v2/pickle.html) my code is: filename = basename(outputFile) + '_' + str(cutoff) + '.xml.gz' network.save(filename) -- Héctor Urbina S. Ingeniero en Bioinformática Fono: 82049138