android提示错误： The process android.process.acore has stopped unexpectedly.Please try again

The Reference URL: 
http://code.google.com/p/android/issues/detail?id=2377

 My solution was:
1. turn off syncing
2. Make a backup of contacts in gmail - ex. export data in csv or vcf 
3. then click "manage applications" ->"contacts storage" -> push button "clear
cache" and "clear data" ---- ATTENTION ! ALL CONTACTS DATA ON PHONE WILL BE LOST !
4. turn on sync again...

By now, this worked for me. I will see if it works for new autosync sessions in the
next days...