Your iPod/iPhone library can be corrupt for two reasons:
The iPod was unplugged without having been properly ejected first
The use of an alternative iPod manager
Please go through this troubleshooter to resolve the problem.
Solution A: Only for CopyTrans Manager users
Restore the last iPod library backup (created automatically by CopyTrans Manager) by following this guide. If the last library does not fix the problem, try the previous one.
If Solution A does not help, don’t forget to restore the iPod library with today’s date through CopyTrans Manager.
Manually add a song to your iPod through iTunes.
Close iTunes and open CopyTrans Manager again to check if the problem is fixed.
WARNING: To avoid “Automatic synchronization” of your iPod by iTunes click and keep the Shift and Ctrl keys pressed while you open iTunes. Please refer to this FAQ article.
Restore your iPod library through iTunes. This solution will always work but is radical.
WARNING: This will completely erase the contents of your iPod. You should create a backup of the iPhone/iPod before you restore.
Backing up iPhone/iPod data before restoring with iTunes
We recommend that you back up the iPhone or iPod data such as songs, videos, photos, contacts, calendars etc before restoring the device with iTunes. Here’s how to do so: Backup iPhone/iPod before restoring
Solution D: Only for iPod Classic and older iPod devices
The below solution is only valid for
iPod Nano up to 5G
iPod Classic, iPod Video and iPod Photo
iPod Shuffle up to 2G
Use CopyTrans Doctor to fix the corrupt iPod library.