Error Code 16-456
16-456 errors can be caused by attempting to schedule a duplicate recording on your AirTV device.
Before troubleshooting, in your Sling app, go to My DVR > Scheduled to see if the recording is already scheduled. If the recording is already scheduled, you can ignore the error.
Try the steps below to resolve the error:
Turn the AirTV device off, then turn it back on.
Open the Sling app on a mobile device or tablet and go to Settings > Over The Air Channels > Remove AirTV. After removing the AirTV, select Set Up AirTV to reconnect the device.
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