RLException Error launching rosbot_description rosbot_rviz_gmapping

Software
1

I am using ROS noetic. Firmware is flashed as tutorial.
When I launch roslaunch rosbot_description rosbot.launch or rosbot_rviz.launch,
the following error pops up:


RLException: while processing /home/husarion/husarion_ws/src/rosbot_description/src/rosbot_description/launch/rosbot_gazebo.launch:
Invalid <param> tag: Cannot load command parameter [robot_description]: no such command [['/opt/ros/noetic/share/xacro/xacro.py', '/home/husarion/husarion_ws/src/rosbot_description/src/rosbot_description/urdf/rosbot.xacro']]. 

Param xml is <param name="robot_description" command="$(find xacro)/xacro.py '$(find rosbot_description)/urdf/rosbot.xacro'"/>
The traceback for the exception was written to the log file

There seems to be an error in finding a xacro.py file?
There is no xacro.py in directory '/opt/ros/noetic/share/xacro/ if it means anything.

2

Hi Mike,
It is probably caused by missing dependencies. Try to install them with this command:

cd <your-workspace>
rosdep install --from-paths src --ignore-src -r -y

If that won’t help, you can try to do all the steps from this readme. Please let me know if it helps.

Best regards
Karol Konkol
Husarion Team

3

In case anyone else comes across this error, here is what’s seems to be causing it:

http://wiki.ros.org/noetic/Migration#Use_xacro_instead_of_xacro.py