ROS Indigo :Cannot show Graph View on smach_viewer

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Hello.

My development environment is Ubuntu14.04 and ROS Indigo.

I tried to execute ROS service as a smach state and it works correctly.

But, when I run smach_viewer, the following errors occured and print nothing. (I think smach_viewer can print this graph in Ubuntu12.04 + ROS Hydro :'()

error message

Exception in thread Thread-6:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 763, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/opt/ros/indigo/lib/smach_viewer/smach_viewer.py", line 848, in _update_graph
    self.set_dotcode(dotstr,zoom=False)
  File "/opt/ros/indigo/lib/smach_viewer/smach_viewer.py", line 866, in set_dotcode
    if self.widget.set_dotcode(dotcode, None):
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/wxxdot.py", line 455, in set_dotcode
    self.set_xdotcode(xdotcode)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/wxxdot.py", line 483, in set_xdotcode
    self.graph = parser.parse()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 1146, in parse
    DotParser.parse(self)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 951, in parse
    self.parse_graph()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 960, in parse_graph
    self.parse_stmt()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 993, in parse_stmt
    self.parse_subgraph()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 974, in parse_subgraph
    self.parse_stmt()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 993, in parse_stmt
    self.parse_subgraph()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 974, in parse_subgraph
    self.parse_stmt()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 1009, in parse_stmt
    self.handle_node(id, attrs)
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 1120, in handle_node
    shapes.extend(parser.parse())
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 608, in parse
    points = self.read_polygon()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 503, in read_polygon
    x, y = self.read_point()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 486, in read_point
    x = self.read_number()
  File "/opt/ros/indigo/lib/python2.7/dist-packages/xdot/xdot.py", line 480, in read_number
    return int(self.read_code())
ValueError: invalid literal for int() with base 10: '274.67'

• When I run the command below, $ rostopic echo /server_name/smach/container_status I receive msg like this.

header: seq: 5 stamp: secs: 1401776891 nsecs: 761457920 frame_id: '' path: /SM_ROOT initial_states: ['SPAWN'] active_states: ['None'] local_data: � }q. info: HEARTBEAT

Many thanks,