also this give me error
//newsletter products
include(DIR_WS_MODULES . 'newsletters/newsletter_products.php');
include(DIR_WS_LANGUAGES . $language . '/modules/newsletters/newsletter_products.php');
$products = new newsletter_products('','', '', '');
$parameters = array('title' => '',
'content' => '',
'module' => '',
'template' => '');
//end newsletter products
this don't give error
//newsletter products
include("includes/modules/". 'newsletters/newsletter_products.php');
include("includes/languages/". $language . '/modules/newsletters/newsletter_products.php');
$products = new newsletter_products('','', '', '');
$parameters = array('title' => '',
'content' => '',
'module' => '',
'template' => '');
//end newsletter products
But nothing is change in the interface, i don't understand if don't working or how use this module