Prestashop backend display error on Paiement and transporter page

on the backend of my Prestashop Site i have an error when i try to go on the payment or transporter page.

Error

so i'm going to the page which is said by the error and on the file i dont know how to resolve the problem because for me all is good

if (!defined('_PS_VERSION_')) {
exit;
} class Wic_EanUpcGenerator extends Module
{   private $html = '';    
private $postErrors = array();    
private $valid_types = array('ean13', 'upc');