Playback error when trying to view live tv

I have a Plex server installed on a Windows 7 machine using a Hauppauge WinTV-HVR-2250 Tuner. I am able to stream content located on my PC fine (mostly .MP4 files).

I just subscribed to Plex Pass and am trying to use the live tv feature.
However, when I attempt to view a Live TV Station using the web interface on the PLEX server pc, I receive a popup box that says “Playback error - Streaming this media is not supported”. My iOS devices also cannot view the live tv.
Does anyone have any suggestions on how I can get this to work.

I am attaching the Plex Media Server log file in case that is helpful in diagnosing this issue. Thank you.