dogwithblog on "[Plugin: Yoast SEO] XML sitemap not working with Yoast plugin"

Hi,
I have a problem with Yoast WordPress SEO: the sitemap is not showing.
Here's the link: http://dogwithblog.in/sitemap_index.xml

I'm getting a page not found error. Sitemap functionality is checked active. I have already tried deactivating and reactivating the plugin but to no avail.

Please suggest!

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