iTunes 10.7(21) 64-bit keeps prompt for Unable to load data class information from sync services

I have just installed the xcode before I resync with iTunes.

I got this problem after sync with iTunes.

My mac running 10.8.2 and latest iTunes 10.7 (21) 64bit. I tried some advices from web but I have no luck:

1. Use sudo to remove the iTunes and resinstall it but it didn't fix the problem.

2. Use Timemachine to restore the AppleMobilexxx.kext and it also didn't fix the problem.

3. I tried to delete all backup ~/Library/Application Support/MobileSync/Backup/, no luck too.

4. I tried to reset the syncservices folder too http://support.apple.com/kb/TS1627

What else can I do now?

Regards,

Jimmy