Can't delete iCloud account from Mail, Contacts, Calendars When trying to log into iCloud from System Preferences, I'm told


  [appleid] is already signed in to iCloud
  
  To use this as your primary iCloud account, delete it from Mail, Contacts, 
  and Calendars and sign in again.


However, I can't delete the account from Mail, Contacts and Calendars.  When I go to that preference pane, I'm prompted for my iCloud password, after which I'm told the account isn't verified.  Checking at http://appleid.apple.com shows that the account is verified. Requesting that another verification email be sent is met with the following error:


  Couldn't request a new verification email because of a server error.


Any ideas how to delete the account from Mail, Contacts and Calendars? I've deleted all other mail accounts. Removed the mail folders and plist files from ~/Library/. Rebooted.  Tried adding a different apple id.  Tried everything I could find from Google that looked even close.  No luck.  Help!
I had the same problem. Fixed it by turning off all sharing (the checkbox options on the right of the panel), THEN trying to delete again.