my login program is not working

Notice (8): Undefined index: RorSubscriber [APP\controllers
\Ror_subscribers_controller.php, line 61]

Code
it bringing

if(empty($this->data) == false)

{

if(($rorSubscriber = $this->RorSubscriber-
>validateLogin($this->data['RorSubscriber'])) == true)

RorSubscribersController::login() - APP\controllers
\Ror_subscribers_controller.php, line 61
Object::dispatchMethod() - CORE\cake\libs\object.php, line 116
Dispatcher::_invoke() - CORE\cake\dispatcher.php, line 227
Dispatcher::dispatch() - CORE\cake\dispatcher.php, line 194
[main] - APP\webroot\index.php, line 88

(default) 6 queries took 52 ms Nr Query Error Affected Num. rows Took
(ms)
1 DESCRIBE `ror_subscribers` 14 14 19
2 DESCRIBE `posts` 5 5 5
3 DESCRIBE `comments` 5 5 5
4 DESCRIBE `tags` 3 3 5
5 DESCRIBE `posts_tags` 3 3 5
6 SELECT `RorSubscriber`.`id`, `RorSubscriber`.`email` FROM
`ror_subscribers` AS `RorSubscriber` WHERE `email` IS NULL AND
`password` IS NULL LIMIT 1

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