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To save others some time, this answer that seemed to work for me:

when I rewrote the 480th row of the /opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py

return int(self.read_code()) -> return int(float(self.read_code()))

Source: http://answers.ros.org/question/172688/ros-indigo-cannot-show-graph-view-on-smach_viewer/?answer=180117#post-id-180117

I got to the solution following the thread above. From what I gather, the problem is that read_code returns a float instead of an int.

To save others some time, this answer that seemed to work worked for me:

when I rewrote the 480th row of the /opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py

return int(self.read_code()) -> return int(float(self.read_code()))

Source: http://answers.ros.org/question/172688/ros-indigo-cannot-show-graph-view-on-smach_viewer/?answer=180117#post-id-180117

I got to the solution following the thread above. From what I gather, the problem is that read_code returns a float instead of an int.