Difficulty with the openai_ros turtlebot2 tutorial when using noetic

asked 2021-04-27 01:31:55 -0600

JorgeMuehlebach gravatar image

I am new to ROS and i have been working through the TurtleBot2 with openai_ros tutorial (http://wiki.ros.org/openai_ros/Turtle...).

When i get up to training the script (step 2) and run :$ roslaunch my_turtlebot2_training start_training.launch. I get the errors:

"No link elements found in urdf file"

"Failed to load nodelet [/cmd_vel_mux] of type [yocs_cmd_vel_mux/CmdVelMuxNodelet] even after refreshing the cache: According to the loaded plugin descriptions the class yocs_cmd_vel_mux/CmdVelMuxNodelet with base class type nodelet::Nodelet does not exist."

After getting this error i then tried to install the yocs_cmd_vel_mux package however, this package does not appear to be available for Noetic. Do i need to use another version of ROS that does have the yocs_cmd_vel_mux package (melodic and kinetic) or is there another solution?

I am using Ubuntu 20.04.2 LTS 64-bit and Noetic.

I hope i have provided enough information.

Some help would be greatly appreciated.

Thank you!

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