After updating to Kit Kat, I did a factory data reset. Now, under settings: Accounts, and Google, I keep getting a sync error. At the bottom of the screen it says Sync is currently experiencing problems and will be back shortly, but it's been like that all day. If I click on the red sync error, it shows a list of Google apps that are synced, but the one app it doesn't show is Google Calendar, which is what I'm trying to get synced. Any suggestions?