[Plugin: WP Page Numbers] Pageing not working with custom loop / post type

Hi,

I have problem with pageing on my site, when i try to go to page 2, i get error 404.
I have custom post type, and using custom query in category.php
Here is my loop:

$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
query_posts($query_string . '&post_type=shop-article&posts_per_page=9&paged='.$paged);
if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

<!-- Content -->

<?php endwhile;
if(function_exists('wp_page_numbers')) : wp_page_numbers(); endif;
else :  _e('<h1 class="error">No products</h1>');
endif;?>

Anyone can help?

Here is example: http://dev.chill.hr/?cat=3

http://wordpress.org/extend/plugins/wp-page-numbers/