Source Not Supported

I am running PMS on a RPi3. I am unable to play any of my mp3 files. I am using a Sony Bravia TV with the Plex app. I can navigate to the files and they will even populate in the app but when I try to play them I get an error stating the media cannot be found or that the data is corrupt. I confirm the files are in fact in place and not corrupt by navigating to them via windows explorer. They will play fine using windows media player. Please help