Roslaunch error - topics quiz

Course Support ROS Basics In 5 Days (Python)
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1

Hi,
I am doing the ROS basics in 5 days and while doing the topics exercise, I am unable to run the launch file. My python script is executable and the node is running perfectly through the rosrun command. I am unable to figure out why the roslaunch command won’t work. Any help would be greatly appreciated.

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My launch file is:

<launch>
    <node pkg='topcs_quiz' type='my_script.py' name='topics_quiz_node' output='screen' >
    </node>
</launch>

Thanks

2
  • Did you make sure your my_script.py is an executable?
  • Did you source the setup.bash of your workspace?
3

Yes, both of these things were done. The my_script.py file is an executable and the setup.bash file was sourced. The node runs perfectly while using rosrun but somehow crashes on roslaunch. I have double checked the file names included in the launch file as well and it seems to be all fine but somehow it crashes on using roslaunch.

4

Hi, make that you have compiled your package using catkin build or catkin_make and then use source devel/setup.bash as well. If it still dooesn’t work, then you can delete the package and create it again and then compile it again. It should work then. Cheers.

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