I got the same thing for a while but then my iPod just blew out completely. For awhile it was still playing but giving me that message when I tried to sync it up. I have another post asking people whether it's worth it to even get this repaired.
I also noticed that my other iPod, which is old as well, conks out when it's too cold, so i don't leave it in my car anymore. These things are delicate
My daughter gets this error message(unknown error-69) when trying to sync her Ipod