Hi Manuel,

There's already an open thread on this at
http://answers.ros.org/question/2032/smach-introspection-server-fails-in-electric

Tully

2011/10/28 Manuel Rodríguez <mrodriguez@robotnik.es>:
> 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)
>
> Has anyone knows how to solve this trouble?
> Best regards,
> Manuel
>
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>



-- 
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827