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In some cases, the error might be triggered if the device has stored a copy of your previously used login credentials on the device and it is using those to login instead of the new ones.
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Launch the app again and try to log in.Click on the “Home” button to return back to the main screen.Swipe the “App’s window” up or down to close it depending on your device.Navigate through the list of recently opened apps until you find the “Sling TV App”.Click on the “Recent Apps” button on your mobile.Relaunch the application and check to see if the issue persists.Click on the “Force Stop” button to close the application completely.Select the “Apps” option and click on the “Sling TV App” button.Navigate your TV home screen and launch settings.You can also check online for the exact method for the device that you are using. Since this method differs for your device, we will include the method for some popular devices. Therefore, in this step, we will be completely closing the app and then relaunching it. This prevents it from being able to log in and it shows the error message. In most cases, the error is caused because the application gets glitched and fails to recognize the correct login credentials.
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