macos - Cannot get docker-machine to start using launchctl on OSX

I am trying to start docker-machine using a launchctl. I have install docker-machine using the docker toolbox. Here is my plist file:

    
        Label
        com.docker.machine.default
        EnvironmentVariables
        
            PATH
            /usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
        
        ProgramArguments
        
            docker-machine
            start
            default
        
        RunAtLoad
        
    

However I get this error, and I unsure how to solve it.

^[[Oct  1 11:08:00 lm com.apple.xpc.launchd[1] (com.docker.machine.default[4157]): Service could not initialize: 14D136: xpcproxy + 13421 [1402][E34BADE4-4125-3886-AA5B-08E47BD0E884]: 0x2