Syncronized Problem with iPad and iTunes & artwork Screen Saver Lost

Hi everyone,

After i had succesfull downgrade from iTunes 11 to iTunes 10.7, all my last setting on iTunes are perfect. But i having some problems after downgraded.

1. When i syncronized all my devices (iPod, iPhone) are success syncronized as usuall except my iPad its seem have problem when syncronized have message appear that say :

The iPad "SIHITEZ iPad"cannot be synced. An unknown error occurred (1156). How to solve that problem?

2. after upgraded from iTunes 11 to iTunes 10.7, my screen saver artwork setting are missing. My screen saver is blank (black screen). I tried to changed to other screen saver but when i setting back to screen saver artwork, are my artwork screen saver dissapear. But on iTunes songs are artwork there.

How to fix it back? i wont lost my beautiful screen saver artwork coz i could play music directly when computer login in required.