If you go to Google Play, log out of your account and log back in.
I had the problem when I had to create an actual gmail account (not just Google Account) in order to see my backed up contacts. Once I added the new account and deleted the old one it worked BUT any contacts that hadn't been synced due to the error were lost. It didn't affect my calendar but I had to reset all my ringtones by contact and reset which number was the default.
While looking into the issue, someone suggested logging out, then back in through Google Play but I'd already removed the old account. It would have saved me a lot of time had I seen it earlier.
Sent from my Galaxy Nexus using Android Central Forums