CloudKit错误:更改令牌已过期,需要重置

Swift 3.1,Xcode 8.3.3

我一直从CloudKit收到一个错误,我不知道该怎么办。

let operation = CKFetchNotificationChangesOperation(previousServerChangeToken: previousChangeToken)

//Hold the notification IDs we processed so we can tell CloudKit to never send them to us again
var notificationIDs = [CKNotificationID]()

operation.notificationChangedBlock = { [weak self] notification in
  guard let notification = notification as? CKQueryNotification else { return }
  if let id = notification.notificationID {
    notificationIDs.append(id)
  }
}

operation.fetchNotificationChangesCompletionBlock = { [weak self] newToken, error in
  if let error = error{
    print(error) //<-- <!> This is the error <!>
  }else{
    self?.previousChangeToken = newToken

    //All records are in, now save the data locally
    let fetchOperation = CKFetchRecordsOperation(recordIDs: recordIDs)

    fetchOperation.fetchRecordsCompletionBlock = { [weak self] records, error in
      if let e = error {
        print("fetchRecordsCompletionBlock Error fetching: \(e)")
      }
      //Save records to local persistence...
    }

    self?.privateDB.add(fetchOperation)

    //Tell CloudKit we've read the notifications
    let operationRead = CKMarkNotificationsReadOperation(notificationIDsToMarkRead: notificationIDs)
    self?.container.add(operationRead)
  }
}

container.add(operation)

错误显示:

<CKError 0x174241e90:“更改令牌已过期”(21/1016);服务器消息

CKServerChangeToken documentation

知道我该做什么吗?