Inder,
I am experiencing the exact same issue. I have reset my OpenID and it still just says "Cannot sync calendar. The credentials for this connection with Google have expired or been revoked. To try again, go to My Profile > Settings and turn syncing back on for this calendar." I have used this now for over a year with no issues and now all the sudden it can't sync? Nothing has changed with my Google account that I am using also. Any help would be greatly apprecaited