First, exit the BET NOW channel by pressing the Home button on your remote, and try launching it again from your channels list.

If that doesn't resolve the problem, uninstall the channel and download the latest version from the Roku Channel Store:
  1. Select the Bet channel in your list of channels.
  2. Press the asterisk (*) button on your remote to bring up a contextual menu, and press Remove Channel
  3. Add the Bet channel again from the Roku Channel Store.
  4. Launch the app from Roku Home.