thanks for your essential plugin.
I'm using it in combination with WooCommerce (all the latest version).
Since one of the recent updates your plugin doesn't generate the product_cat-sitemap.xml anymore.
I've noticed in Google Webmaster Tools since there was an error icon and it can't found it.
It is listed in my sitemap_index.xml (with even the modify date) but if I click on the link I get a 404 error.
What could be the problem?