vendor slug 404 error when apply filter

hello everybody!
I just followed the instructions from the documentation (http://docs.woothemes.com/document/product-vendors/) to change the slug of the vendor adding this code and click “Save Changes” in the Permalinks area. All the targets of the links changes to the new url but when I click any of them I get the 404 page. I’m using wordpress 4.1.1, WooCommerce 2.3.5 and Salient theme.

Thanks for your attention and help 🙂

add_filter( 'product_vendors_vendor_slug', 'change_vendor_url_slug' );
function change_vendor_url_slug( $slug ) {
  $slug = 'new_url';
  return $slug;
}

https://wordpress.org/plugins/woocommerce/