Hello, jalag5562. I hate to hear that you're having an issue with accessing live TV from your DISH Anywhere App. I would be happy to help you. Which model of Hopper do you have? The model should be on the front of your receiver towards the left hand side.
Thank you for the information, jalag5562. To watch live TV through DISH Anywhere it does require a Sling device. These devices are built into some of the Hoppers. However, the Hopper Duo does not contain this device. This is why you're getting this error message when you try to access live TV.