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Perhaps in move_group_options try changing /robot_description to robot_description. It appears that you use some namespace parameters during the launch and using a / in front of robot_description sets the MoveGroupInterface to search for it in the global namespace, which might mean - outside of the namespace you use. For more info on namespaces you can check out Names. To see where everything is launched, you can use rqt_graph! Let me know if this has been useful!