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asked 2011-09-21 02:11:36 -0500

Wouter gravatar image


I am trying to perform the move_arm tutorials for the pr2. Once I run ./bin/move_arm_joint_goal in the 'simple_armstack_goals' package I am getting the following error:

Do you have any idea what causes this error?

I using ROS Electric on Ubuntu 11.04.

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The error did somehow not occur: [ERROR] [1316612972.596361511, 2.494000000]: Client [/move_right_arm] wants topic /move_right_arm/goal to have datatype/md5sum [arm_navigation_msgs/MoveArmActionGoal/d560cc046d6b5e8bf3f70a960054d6c6], but our version has [move_arm_msgs/MoveArmActionGoal/9b271f91d996a
Wouter gravatar image Wouter  ( 2011-09-21 02:53:03 -0500 )edit

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answered 2011-09-21 03:27:31 -0500

You should check that both the client (your program) and the robot are running the same version of ROS. If you switched from diamondback to electric many packages should at least be recompiled.

Also be sure that you are sourcing the right setup.bash file (usually /opt/ros/electric) in your .bashrc.

Electric has a diferent structure for the arm_navigation, so probably this is the cause of your error.

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I am using electric and have /opt/ros/electric in my .bashrc. So do you mean that the ompl_ros_interface tutorials do not work in electric anymore? I recompiled the packages that are needed for the ompl_ros_interface tutorials but the error still remains there.
Wouter gravatar image Wouter  ( 2011-09-21 07:10:29 -0500 )edit
Lorenzo is right, the error means that the two nodes communicating over the topic were compiled using two different versions of the MoveArmActionGoal message. Run `env | grep ROS`, check ROS_ROOT and ROS_PACKAGE_PATH and run rosmake on all involved packages.
Martin Günther gravatar image Martin Günther  ( 2011-09-22 01:50:30 -0500 )edit
You're both right, after re-compiling all involved packages it worked. I forgot one package previously. Thanks or your help!
Wouter gravatar image Wouter  ( 2011-09-25 19:49:58 -0500 )edit

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Asked: 2011-09-21 02:11:36 -0500

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Last updated: Sep 21 '11