Problem running erratic_robot.

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Hello,

I have downloaded the possible tools to run the erractic_robot in gazebo but when I try to roslaunch (roslaunch erratic_description erratic_empty_world.launch) it, it gives me an error:

[erratic_description] is not a package or launch file name

I have the erractic_description and I can look into the folder that the roslaunch is trying to access but it keeps denying me.

Any help is MUCH appreciated!

Thanks in advance!