In the Admin "Categorie Management", when I click on Images Info I receive a error message:

Fatal error: Call to a member function on a non-object in /var/www/free.fr/f/5/fuji.s602z/admin/infos_images.php on line 256

The line 256 is:

  $sub = $vtp->Open('./template/'.$user['template'].'/admin/infos_image.vtp');