I have figured it out.
I had this problem for almost 2 months. But I fix it today. Anyways
1. Go to Settings
2. Go to Application Manager
3. Go to manage application click the tab (All)
4. Find the following and Clear their Data by clicking "Clear Data"
(1)Google backup Transport
(2)Google calander sync (3)Google Contact sync (4)Google Partner set up
(5)Google Play services (6)Google services Framework.
And you are Done
Problem Fixed. Cheers
Go and Sync Your Account(Gmail)
i hope it works for you.
just signed up to help