Playlist Says songs in Wrong Format

I have a playlist set up in Astiga. When I ask my Google Home to have Astiga play the playlist, it plays a couple songs and then part way through the third song it stops and says that the song is in the wrong format. All of my songs are in the mp3 format so I don't understand this message. How can I get the playlist to play all the songs on the list? Do I need to remove and reload all of my songs to Google Drive?