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Unable to open REV Robotics USB Expansion Hub Portal

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  • Unable to open REV Robotics USB Expansion Hub Portal

    When we were about to run our final programs, an error reading "Unable to open REV Robotics USB Expansion Hub Portal" came up. I don't know what this means and how to fix it. None of our programs will run. Does anyone know how to fix this error?

  • #2
    That mean that your phone isn't connected to your hub. Try changing your OTG wire between the phone and the hub, that's typically the source of the error.

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