Message: Undefined property: Register::$ezauth

[eluser]v33s[/eluser]
Hi, I am using ez_Auth and I have to solve the problem about registration

I got this message when i press button Register:

A PHP Error was encountered

Severity: Notice

Message: Undefined property: Register::$ezauth

Filename: controllers/register.php

Line Number: 13

Fatal error: Call to a member function authorize() on a non-object in C:\Program Files\VertrigoServ\www\xxx\application\controllers\register.php on line 13

My controller:

Code:

<?php

class Register extends Controller
{
    function __contruct()
    {
        parent::Controller();
        $this->load->model('EzAuth_Model', 'ezauth');
    }

function index()
    {
        $data = array();
        $rules = array(
            'username'                =>    'trim|required|min_length[5]|max_length[30]',
            'email'                    =>    'trim|required|valid_email',
            'password'                =>    'required|matches[password_repeat]',
            'password_repeat'        =>    'required');
        $fields = array(
            'username'                =>    'username',
            'email'                    =>    'email',
            'password'                =>    'pass',
            'password_repeat'        =>    'pass repeat'
        );
        $this->validation->set_rules($rules);
        $this->validation->set_fields($fields);

        if ($this->validation->run())
        {
            $inp = array(
                'ez_users'    =>    array(
                    'username'        =>    $this->input->post('username'),    
                    'email'            =>    $this->input->post('email')
                ),
                'ez_access_keys' => array(
                    'profile_view'      => 'user',
                    'peofile_edit'      => 'user',
                    'profile_payment' => 'user',
                    'profile_add'      => 'user',
                    'profile_logout'  => 'user',
                ),
                'password'    =>    $this->input->post('password'),
            );
            $user_reg = $this->ezauth->register($inp);
            if ($user_reg['reg_ok'] == 'yes') {
                $v_code = $user_reg['code'];

                $message = 'msg !!!!!!';
                
                $this->_send_mail($inp['ez_users']['email'], 'verify', $message);
                
            }
            if ($user_reg['reg_ok'] == 'yes') {
                $this->load->view('messages/reg_ok');
            } else {
                $data['disp_error'] = $user_reg['error'];
            }
        }
        
        $this->load->view('register_view', $data);
    }

What`s the problem?