[Plugin: Better WordPress Google XML Sitemaps (with sitemapindex, multi-site and Google News sitemap

I installed the plugin and configured it. I made sure the Google News option was checked. But no google news XML was ever generated. I got this error:

BWP Google XML Sitemaps Error: post_google_news.xml does not have any item. You can fix this easily by excluding any post types / terms you do not use in Sitemap Generator tab within your admin area. If you still see this error, consider checking the module that generates this sitemap (post_google_news.php).

I guess I just don’t understand what’s happening here.

http://wordpress.org/extend/plugins/bwp-google-xml-sitemaps/