CodeIgniter 2 - captcha helper? -

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i cant seem ci2's captcha helper work... can point out doing wrong?

i think i've followed steps on doc's im not getting event print_r(get_defined_vars()) isnt showing anything... :(

my controller 

 function index() {
     $this->load->helper('form');     $this->load->helper('captcha');     $this->load->model('captcha');  
  
   $vals = array(     'word'   => 'random word',     'img_path'   => '../images/captcha/',     'img_url'    => 'http://mysite/images/captcha/',     'font' => '../../system/fonts/texb.ttf',     'img_width'  => '150',     'img_height' => 30,     'expiration' => 7200,     "time" => time()    );     $data['cap'] = create_captcha($vals);     $cap = array(     'captcha_time'  => $vals['time'],     'ip_address'    => $this->input->ip_address(),     'word'   => $vals['word']    );     $this->captcha_model->insert_captcha($cap);    //print_r(get_defined_vars());        $data['main_content'] = 'admin/landing.php';    $this->load->view('includes/template', $data); 
  
}
model 
 function input_captcha($data) {     $query = $this->db->insert_string('captcha', $data);     $this->db->query($query); }
view 
 <section>     <h3>you must captcha captcha before proceeding demise!</h3>     <article>         <?php echo form_open('admin/auth');?>             <p>who f you?</p>             <?php echo form_input('email', 'your real email!');?>             <br>             <?php    echo 'submit word see below:';?>             <br>             <?php    echo $cap['image'];?>             <br>             <?php    echo '<input type="text" name="captcha" value="" />';   ?>
             <br>             <?php echo form_submit('submit', 'send it!');?>
         <?php echo form_close();?>     </article> </section>

the problem in path's images. 1 thing, log threshold set four, getting no indication of kind of problem. set absolute paths , worked fine...

     function index()     {            $this->load->helper('form');         $this->load->helper('captcha');         $this->load->model('captcha_model');          $vals = array(             'img_path'   => '/var/www/mysite.com/images/captcha/',             'img_url'    => 'http://mysite.com/images/captcha/',             'font' => '../../system/fonts/texb.ttf',             'img_width'  => '150',             'img_height' => 30,             'expiration' => 7200,             "time" => time()             );          $data['cap'] = create_captcha($vals);          $cap = array(             'captcha_time'  => $data['cap']['time'],             'ip_address'    => $this->input->ip_address(),             'word'   => $data['cap']['word']             );          $this->captcha_model->add_captcha($cap);          $data['main_content'] = 'admin/landing.php';         $this->load->view('includes/template', $data);     }

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