Problem with Math Captcha component @ 1.3.6

Hello, i trying to use this small piece of code

http://jamienay.com/2009/06/math-captcha-component/

here its my code:
###############################################################

MODEL:

class Contact extends AppModel {
var $name = 'Contact';
var $useTable = false;

var $_schema = array(
'name' =>array('type' => 'string', 'length' => 100),
'email' =>array('type' => 'string', 'length' => 255),
'subject' =>array('type' => 'string', 'length' => 255),
'message' =>array('type' => 'text')
);

var $validate = array(
'name' => array('minLength' => array('rule' =>
array('minLength', 3))),
'email' => array('email' => array('rule' => 'email')),
'subject' => array('notempty' => array('rule'=>'notempty')),
'message' => array('minLength' => array('rule' =>
array('minLength', 60)))
);

}
###########################################################

Controller:
....
var $components = array('RequestHandler', 'Email', 'Session',
'MathCaptcha');

function index() {
$this->set('controller_name', __('Contact',true));
$this->set('action_name', __('Index',true));
if ($this->RequestHandler->isPost()) {
$this->Contact->set($this->data);
if ($this->MathCaptcha->validates($this->data['Contact']
['security_code'])) {
if ($this->Contact->validates()) {
$this->Email->to =
Configure::read('Setting.Site.email') ;
$this->Email->subject = $this->data['Contact']
['subject'];
$this->Email->from = $this->data['Contact']['email'];
$this->Email->send($this->data['Contact']['message']);
}

}else {
$this->Session->setFlash(__('Please enter the correct
answer to the math question.', true));
}
}
$this->set('mathCaptcha', $this->MathCaptcha-
>generateEquation());
}

######################################################

view

<?php
echo $this->Form->input('name',array('label'=>__('Your
Name',true),'error'=>array('minLength'=>__('You must enter your full
name!',true))));
echo $this->Form-
>input('email',array('error'=>array('email'=>__('Please enter your
valid email!',true))));
echo $this->Form->input('subject',array('options'=>array(null
=>__('-- Choose One --',true),

__('Jobs',true)=>__('Jobs',true),

__('Orders',true)=>__('Orders',true),

__('Products',true)=>__('Products',true),

__('Brands',true)=>__('Brands',true),

__('Services',true)=>__('Services',true),

__('Partners',true)=>__('Partner',true),

__('Promotion',true)=>__('Promotion',true),

__('Other',true)=>__('Other',true)),
'label'=>__('Type of
message',true),

'error'=>array('notempty'=>__('Please choose one',true))));
echo $this->Form-
>input('message',array('type'=>'textarea','label'=>__('Message',true),'error'=>array('minLength'=>__('Your
message is to short!',true))));
echo $form->input('security_code', array('label' => __('Please
Enter the Sum of ',true) . $mathCaptcha));
?>

I detected a problem in the components, function registerAnswer not
work as intended, that does not set the session.

Help me to solve a problem:)

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