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The actionName won't be a path.. I think it will be just the root name of the action type; in this place "Control", or if that isn't unique then the package_name/action_name (control/Control). Then rosbridge will have to find that action. So make sure that the control package is built, and you've sourced the devel/setup.bash in the workspace where you built it before you run rosbridge. If you need help building your ros workspace, see this tutorial: http://wiki.ros.org/catkin/Tutorials/create_a_workspace