DVD player vs DVD with MP3s on it

I just bought a Kenwood DDX 6019 Car DVD player.

I used a DVD-R disk to put 66 directories with about 10 to 15 MP3s in each directory.

The DVD player will not recognize the disk. Not sure if it is because it is to many directories or is is the way I recorded it. It is just a data disk.

The manual does not really address data disks.

Any help out there???

Well I found this thread and it seems there is not a way.