SMACH tutorial: ImportError: No module named msg

asked 2012-09-18 10:23:42 -0500

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I got error while trying to run the ./examples/state_machine.py in smach_tutorials package

Traceback (most recent call last): File "/home/tienthanh/workspace/ros/fuerte/mebios/tienthanh/executive_smach_tutorials/smach_tutorials/examples/state_machine.py", line 21, in <module> import smach_ros File "/opt/ros/fuerte/stacks/executive_smach/smach_ros/src/smach_ros/__init__.py", line 55, in <module> from action_server_wrapper import ActionServerWrapper File "/opt/ros/fuerte/stacks/executive_smach/smach_ros/src/smach_ros/action_server_wrapper.py", line 9, in <module> from actionlib.simple_action_server import SimpleActionServer File "/home/tienthanh/workspace/ros/fuerte/mebios/tienthanh/executive_smach_tutorials/smach_tutorials/examples/actionlib.py", line 27, in <module> from actionlib.msg import * ImportError: No module named msg

Output of "echo $PYTHONPATH" is /opt/ros/fuerte/share/ros/core/roslib/src:/opt/ros/fuerte/lib/python2.7/dist-packages:

I use ROS fuerte, Ubuntu 12.04 32 bit.

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answered 2012-09-18 10:53:31 -0500

This post is a wiki. Anyone with karma >75 is welcome to improve it.

It looks like the tutorial was never updated when actionlib.

The line should read:

from actionlib_msgs.msg import *

I've filed a ticket here: https://kforge.ros.org/smach/trac/ticket/2

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I change in smach_tutorials/examples/actionlib.py as you advice: from actionlib_msgs.msg import *

But I got another error: ... action_server_wrapper.py", line 9, in <module> from actionlib.simple_action_server import SimpleActionServer ImportError: No module named simple_action_server