Plexamp headless raspberrypi, Couldn't start Playback

Hello,

I have v.4.12.4 running on Raspberry Pi 3B. Whenever i try to play a track using the web ui, i get an error ‘Couldn’t start Playback’. What could be the issue?

Thanks

while in the web ui, open the cast menu, select the player name for your Pi (if it isn’t selected already) … now close the cast menu and try to start playback again