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Hey people from the future, I figured it out. What I did to fix this is to add the following to rover_control.launch:

So for some reason, the launch file cannot find the URDF model, I guess. So we have to show ros the way.

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No.2 Revision

Hey people from the future, I figured it out. What I did to fix this is to add the following to rover_control.launch: rover_control.launch:

<param name="robot_description" command="cat $(find rover_project)/rover_description/urdf/rover.urdf"/>

So for some reason, the launch file cannot find the URDF model, I guess. So we have to show ros the way.