Hi all,

I'm using smach with the introspection server and the smach_viewer.py but does not work fine (it just shows the machine but does not update in which state the machine is), moreover the script running the introspection server periodically shows the following exception:

Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 532, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.6/threading.py", line 484, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/opt/ros/electric/stacks/executive_smach/smach_ros/src/smach_ros/introspection.py", line 160, in _status_pub_loop
    self._publish_status('HEARTBEAT')
  File "/opt/ros/electric/stacks/executive_smach/smach_ros/src/smach_ros/introspection.py", line 225, in _publish_status
    self._status_pub.publish(state_msg)
  File "/opt/ros/electric/stacks/ros_comm/clients/rospy/src/rospy/topics.py", line 695, in publish
    self.impl.publish(data)
  File "/opt/ros/electric/stacks/ros_comm/clients/rospy/src/rospy/topics.py", line 872, in publish
    serialize_message(b, self.seq, message)
  File "/opt/ros/electric/stacks/ros_comm/clients/rospy/src/rospy/msg.py", line 151, in serialize_message
    msg.serialize(b)
  File "/opt/ros/electric/stacks/executive_smach/smach_msgs/src/smach_msgs/msg/_SmachContainerStatus.py", line 120, in serialize
    buff.write(struct.pack('<I%ss'%length, length, _x.encode()))
UnicodeDecodeError: 'ascii' codec can't decode byte 0x80 in position 0: ordinal not in range(128)