Hook::exec('displayPayment') return blank page

[se1989rg]

Hi, I develop a module and I need html, which returns display payment hook, to use in backoffice module configure page. In front office all good.

This is my code
 

       $displayPayment = Hook::exec('displayPayment');

 

        $html = str_get_html($displayPayment);

        $i = 0;

        foreach($html->find('a') as $a) {            

        

                $payment_methods[$i]['id_option'] = $i;           

                $payment_methods[$i]['payment_method'] = $a->plaintext;  

            

            

            $i++;

        }

I found that after calling 

$result = $this->getCurrentSubTemplate($template, $cacheId, $compileId)->fetch();

 

in class ModuleCore method display() showing blank page(debug mode enable).

Any help please?

Edited February 9, 2015 by se1989rg (see edit history)