rosmsg show beginner_tutorials/Num (error???)

asked 2014-04-02 17:07:53 -0500

juanquy
55 ●3 ●4 ●5

updated 2016-10-24 09:02:38 -0500

ngrennan
1 ●1 ●1

Hi guys I been fallowing beginner tutorial, I'm a newbie ok.

So when i wrote in my terminal :

$ rosmsg show beginner_tutorials/Num

I got this error :

$ rosmsg show beginner_tutorials/Num
Unable to load msg [beginner_tutorials/Num]: Cannot locate message [Num]: unknown package [beginner_tutorials] on search path [{'rosconsole': ['/opt/ros/hydro/share/rosconsole/msg'], 'catkin': ['/opt/ros/hydro/share/catkin/msg'], 'qt_dotgraph': ['/opt/ros/hydro/share/qt_dotgraph/msg'], 'image_view': ['/opt/ros/hydro/share/image_view/msg'], 'carrot_planner': ['/opt/ros/hydro/share/carrot_planner/msg'], 'urdf': ['/opt/ros/hydro/share/urdf/msg'], 'rosgraph': ['/opt/ros/hydro/share/rosgraph/msg'], 'rqt_py_console': ['/opt/ros/hydro/share/rqt_py_console/msg'], 'nodelet_topic_tools': ['/opt/ros/hydro/share/nodelet_topic_tools/msg'], 'rqt_graph': ['/opt/ros/hydro/share/rqt_graph/msg'], 'rotate_recovery': ['/opt/ros/hydro/share/rotate_recovery/msg'], 'fake_localization': ['/opt/ros/hydro/share/fake_localization/msg'], 'qt_gui': ['/opt/ros/hydro/share/qt_gui/msg'], 'filters': ['/opt/ros/hydro/share/filters/msg'], 'eigen_conversions': ['/opt/ros/hydro/share/eigen_conversions/msg'], 'navfn': ['/opt/ros/hydro/share/navfn/msg'], 'dwa_local_planner': ['/opt/ros/hydro/share/dwa_local_planner/msg'], 'rosgraph_msgs': ['/opt/ros/hydro/share/rosgraph_msgs/msg'], 'smclib': ['/opt/ros/hydro/share/smclib/msg'], 'rosparam': ['/opt/ros/hydro/share/rosparam/msg'], 'roscpp_serialization': ['/opt/ros/hydro/share/roscpp_serialization/msg'], 'diagnostic_msgs': ['/opt/ros/hydro/share/diagnostic_msgs/msg'], 'rosbuild': ['/opt/ros/hydro/share/rosbuild/msg'], 'rosclean': ['/opt/ros/hydro/share/rosclean/msg'], 'tf': ['/opt/ros/hydro/share/tf/msg'], 'rqt_publisher': ['/opt/ros/hydro/share/rqt_publisher/msg'], 'roswtf': ['/opt/ros/hydro/share/roswtf/msg'], 'geometric_shapes': ['/opt/ros/hydro/share/geometric_shapes/msg'], 'smach_ros': ['/opt/ros/hydro/share/smach_ros/msg'], 'rqt_web': ['/opt/ros/hydro/share/rqt_web/msg'], 'shape_msgs': ['/opt/ros/hydro/share/shape_msgs/msg'], 'trajectory_msgs': ['/opt/ros/hydro/share/trajectory_msgs/msg'], 'costmap_2d': ['/opt/ros/hydro/share/costmap_2d/msg'], 'robot_state_publisher': ['/opt/ros/hydro/share/robot_state_publisher/msg'], 'visualization_msgs': ['/opt/ros/hydro/share/visualization_msgs/msg'], 'resource_retriever': ['/opt/ros/hydro/share/resource_retriever/msg'], 'rqt_topic': ['/opt/ros/hydro/share/rqt_topic/msg'], 'smach': ['/opt/ros/hydro/share/smach/msg'], 'rqt_action': ['/opt/ros/hydro/share/rqt_action/msg'], 'rqt_top': ['/opt/ros/hydro/share/rqt_top/msg'], 'rqt_rviz': ['/opt/ros/hydro/share/rqt_rviz/msg'], 'move_base': ['/opt/ros/hydro/share/move_base/msg'], 'rosboost_cfg': ['/opt/ros/hydro/share/rosboost_cfg/msg'], 'genmsg': ['/opt/ros/hydro/share/genmsg/msg'], 'xacro': ['/opt/ros/hydro/share/xacro/msg'], 'rqt_robot_dashboard': ['/opt/ros/hydro/share/rqt_robot_dashboard/msg'], 'rqt_service_caller': ['/opt/ros/hydro/share/rqt_service_caller/msg'], 'rqt_msg': ['/opt/ros/hydro/share/rqt_msg/msg'], 'pluginlib': ['/opt/ros/hydro/share/pluginlib/msg'], 'rosdoc_lite': ['/opt/ros/hydro/share/rosdoc_lite/msg'], 'rosserial_python': ['/opt/ros/hydro/share/rosserial_python/msg'], 'rosmaster': ['/opt/ros/hydro/share/rosmaster/msg'], 'nodelet_tutorial_math': ['/opt/ros/hydro/share/nodelet_tutorial_math/msg'], 'rosnode': ['/opt/ros/hydro/share/rosnode/msg'], 'rqt_pose_view': ['/opt/ros/hydro/share/rqt_pose_view/msg'], 'bond': ['/opt/ros/hydro/share/bond/msg'], 'self_test': ['/opt/ros/hydro/share/self_test/msg'], 'image_geometry': ['/opt/ros/hydro/share/image_geometry/msg'], 'pcl_conversions': ['/opt/ros/hydro/share/pcl_conversions/msg'], 'actionlib_msgs': ['/opt/ros/hydro/share/actionlib_msgs/msg'], 'image_rotate': ['/opt/ros/hydro/share/image_rotate/msg'], 'rqt_image_view': ['/opt/ros/hydro/share/rqt_image_view/msg'], 'rqt_console': ['/opt/ros/hydro/share/rqt_console/msg'], 'joint_state_publisher': ['/opt/ros/hydro/share/joint_state_publisher/msg'], 'rosserial_client': ['/opt/ros/hydro/share ...

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answered 2014-04-03 05:03:09 -0500

demmeln
4306 ●32 ●45 ●69

You will need to first source the setup files for the workspace where beginner_tutorials is located. I.e. something like source /path/to/your/workspace/devel/setup.bash. Only then will ros be able to find your package.

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I am also a newbie and this worked for me but I don't quite understand. I have sourced 'source /opt/ros/hydro/setup.bash to my ~/.bashrc file so the ROS commands should work each time and they do, but why do I need to source if I'm already working in that directory?

JoSo ( 2014-06-17 13:23:32 -0500 )edit

ROS uses the environment to search for packages, not the current directory. Check out this tutorial, in paritcular "4. Create a ROS workspace": http://wiki.ros.org/ROS/Tutorials/InstallingandConfiguringROSEnvironment

demmeln ( 2014-06-17 13:44:46 -0500 )edit

Sourcing the setup files in the workspace worked for me. Inside ~/catkin_ws , the command "source devel/setup.bash" should do the trick.

luc ( 2014-06-23 11:52:48 -0500 )edit

Is that means I should run the command "source ~/catkin_ws/devel/setup.bash" every time I use ROS?

张京林 ( 2014-07-25 04:07:48 -0500 )edit

You can run it every time you use ROS, or you can add it to your shell startup script: ~/.bashrc

ahendrix ( 2014-07-25 04:15:30 -0500 )edit

Should I use the command below, if I want to add it to the shell startup script? echo "source ~/catkin_ws/devel/setup.bash" >> ~/.bashrc source ~/.bashrc

张京林 ( 2014-07-25 04:36:07 -0500 )edit

That will work, but I generally think it's better to open your bashrc in an editor and actually try to understand what's going on, rather than just appending random commands to it.

ahendrix ( 2014-07-25 04:46:32 -0500 )edit

OK, thank you very much!

张京林 ( 2014-07-25 04:59:10 -0500 )edit

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