I will need a little more info to answer this. Which error message are you getting?
If you aren't getting any error messages you need to do this:
First step : when you plug your iPod into your computer, does it show up under devices?
Second step : look on the page, if it says that the "manage songs and videos by yourself" thing is checked, uncheck it.
Third step: click apply.
Hope it helps. If it doesn't tell me and I'd try to figure.
You have accepted my answer but I am concerned if it helped you. Has it solved the problem?