CalDAVAccountRefreshQueueableOperation Server Errors

Are You Seeing the ‘CalDAVAccountRefreshQueueableOperation’ server error in iCal?

When using iCal (Mac OS X Calendar), you may see this error every few minutes:

“Server responded with “400” to operation CalDAVAccountRefreshQueueableOperation”

If you happen to see this message while using Calendar or iCal for the Mac, try this solution:

  1. Launch iCal or Calendar for the Mac
  2. Select “Preferences” from the Calendar (or iCal) menu
  3. Locate the “Accounts” tab
  4. Notice if there are any old accounts in there, most specifically a Yahoo account
  5. If you find a Yahoo account, delete this account by hitting the minus button below
  6. See if the CalDAVAccountRefreshQueueableOperation server error stops
  7. Add the Yahoo account back if you need it for calendar access

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