Sorry the player does not support this type of audio file

[Orxan78]

I downloaded a bunch of music videos from youtube and later converted them to mp3 using an m4a to mp3 converter. Once converted, I noticed it had 0 bytes and converted within a blink of an eye. I then placed it on my sd card and when I tried to play it, it said "Sorry the player does not support this type of audio file". Now, I have converted many music videos (MP4 files) to mp3 with the S4 so it is possible but not in some cases. Does anyone know why it's doing this and how I can fix it?