RealmでValue of type 'Realm' has no member 'removeNotifications'のエラーが出ます

Realmを使用してみようと思いまして、以下のように記述した際

if token != nil {
    realm.removeNotifications(token)

の箇所で

Value of type 'Realm' has no member 'removeNotifications'と言われます。

どのような事が考えられますでしょうか。

var token: NotificationToken!

@IBAction func startButtonDidTap(sender: AnyObject) {
    let realm = try! Realm()
    if isUpdating == true {
        // Stop
        isUpdating = false
        locationManager.stopUpdatingLocation()
        startButton.setTitle("Start", forState: UIControlState.Normal)
        // Remove a previously registered notification
        if token != nil {
            realm.removeNotifications(token)  //Value of type 'Realm' has no member 'removeNotifications'
        }
    }
    else {
        // Start
        isUpdating = true
        locationManager.startUpdatingLocation()
        startButton.setTitle("Stop", forState: UIControlState.Normal)
        // Add a notification handler for changes
        token = realm.addNotificationBlock {
            [weak self] notification, realm in
            self?.tableView.reloadData()
        }
    }
}