Sitemap Error in NGINX Server

Hi!

I changed to NGINX server. In the sitemap page is showing a message, see the image: http://medgeo.com.br/imagens/nginx.jpg

Have added the rules in my control panel but the message still appears.

How can I solve this ‘problem’.

Thanks a lot.
Pedro Henrique.

https://wordpress.org/plugins/wordpress-seo/