roslaunch command producing RLException

ROS1
melodic

asked 2021-12-22 11:41:44 -0600

oferbar
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updated 2021-12-22 11:43:58 -0600

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10937 ●203 ●339 ●330 http://www.linkedin.co...

I accidently delete ROS from my Ubuntu 18. After reinstalling, Im trying to use roslaunch command and execute a .launch file from a known package - which worked perfectley untill i reinstalled ROS. Can anyone please point out something that might be a problem, or a solution?

user@User:~/catkin_ws$ roslaunch pkg_name launch_name.launch
RLException: [launch_name.launch] is neither a launch file in package [pkg_name] nor is [pkg_name] a launch file name
The traceback for the exception was written to the log file

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answered 2021-12-22 11:49:06 -0600

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10937 ●203 ●339 ●330 http://www.linkedin.co...

A bit more detail is needed to understand but I'd just guess the package pkg_name is not in ROS_PACKAGE_PATH so that roslaunch is unable to reference to the package. Sourcing setup.*sh in your workspace would resolve.

This thread may be the duplicate of #q143496

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Thank you, that was the problem indeed.

oferbar ( 2021-12-22 12:29:59 -0600 )edit

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answered 2021-12-22 12:28:57 -0600

oferbar
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Okay so the problem was indeed ROS_PACKAGE_PATH. This is probably one of the most basic actions to perform, still thouogh, wasted a lot of time on it, so it might help others:

after creating your catkin_ws, Open the terminal and type:

gedit .bashrc

In the text file that opens, add these rows:

source /opt/ros/distro/setup.bash

source /home/user/catkin_ws/devel/setup.bash

Change distro and user as it suites you. save and exit.

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roslaunch command producing RLException

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