Some users have reported that iPod Touch / iPhone would not sync with iTunes and gave this error: “…cannot be synced. An unknown error occurred (13019)”.
To try to solve this issue, try the following steps:
Please update to the latest version of iTunes. If updating to latest version of iTunes does not resolve the issue, then:
1. Select the iPhone or iPod touch in iTunes under Devices.
2. Click the Music tab and under the Sync music option, choose Selected playlists.
3. Deselect the Voice Memos playlist.
4. Click Apply and then click Sync.
If the above steps do not resolve the issue, check the device and the iTunes library for duplicate voice memos. If you find any duplicate voice memos, delete the duplicates and then sync.
If those steps do not resolve the issue, then:
1. Select the iPhone or iPod touch in iTunes under Devices.
2. Click the Music tab and deselect the Sync Music option.
3. Click Apply and then click Sync.
4. After the sync is complete, reselect the Sync Music option.
5. Click Apply and then click Sync.
If the Error 13019 occurs while syncing content other than music, then perform the same steps above but uncheck the content that stops syncing with Error 13019.
If the steps above do not resolve the issue, attempt to sync an empty iTunes music library to the device while logged in as a new admin user.