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Hi,

I get the similar error message. The following links: https://answers.ros.org/question/293830/what-is-the-fix-for-no-p-gain-specified-for-pid-namespace-gazebo_ros_controlpid_gainsback_right_wheel_joint-ros-melodic/

And another link: http://answers.gazebosim.org/question/5468/gazebo_ros_pkgs-no-p-gain-specified-for-pid-in-positionjointinterface/

I follow the suggestion in links and remove the error message, but my robot collapse in Gazebo.

Note: In the links, they said this is not fatal error ( and I can control my robot in Gazebo with the error message), so I choose to not fixes this error now ;)

Best,