Apple TV reports "Can't Playback because the connection with your server was lost"
I have a Mac mini running PLEX on a local area network. I have my Apple TV's connected via physical ethernet cables to a switching hub. Everything seems to work fine however when I play a Playlist or do a Shuffle Videos I get an error of "Can't continue playback because the connection with your server was lost". I have 4 Apple TV's and it happens on all of them.
Please help! I need to create a media server that works without a internet connection for a trade show.