Song cannot be played on this iPhone I have recently added a number of songs to my iTunes playlist (all mp3s). When syncing them over to my iPhone I get an error saying that 'X track cannot be played on this iPhone'.

What could be the reason for this? The file isn't from the iTunes store so I don't think DRM on the track.

What could be the issue?
I had this issue this morning. I had to force quit iTunes, unplug my iPhone, reboot it, then reconnect it and sync the playlists that wouldn't sync earlier. It seemed to work, as I now have those playlists. I think iTunes experienced a technical issue somehow with its encoding process.