Code 310: The file has been added to iTunes media library but not to your iPod. Please check iTunes synchronization settings for your iPod and synchronize the file then.
From SoundTaxi
Why do I receive "The file has been added to iTunes media library but not to your iPod. Please check iTunes synchronization settings for your iPod and synchronize the file then" error?
If SoundTaxi detects a problem with your syncing settings, it will notify you with "The file has been added to iTunes media library but not to your iPod. Please check iTunes synchronization settings for your iPod and synchronize the file then" error message. Files won't be copied to the device in this case.
How to fix "The file has been added to iTunes media library but not to your iPod. Please check iTunes synchronization settings for your iPod and synchronize the file then" error?
If you see this error message, make sure your iTunes settings are configured.
Open iTunes and click on your iPod, iPhone or iPad under the "Devices" submenu. In the main window, navigate to the "Movies" tab, check the "Sync Movies" option and select how many recent movies you want to automatically be copied to your device during each sync session. Navigate to the "Music" tab, check the "Sync Music" option. Click "Apply".
If your settings look correct, manually click the "Sync" button in iTunes to copy your files to your iPod / iPhone / iPad.
