sitemap_index.xml 404

First off, I don’t have W3 Total Cache installed.

I found this hack but it’s not doing anything for me:

# WordPress SEO - XML Sitemap Rewrite Fix
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^sitemap_index\.xml$ /index.php?sitemap=1 [L]
RewriteRule ^([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 [L]
</IfModule>
# END WordPress SEO - XML Sitemap Rewrite Fix

When I view the ‘sitemap_index.xml’ I get a 404 error.

I’d really like to use the plugin but can’t if it can’t generate or display the sitemap.

https://ww.wp.xz.cn/plugins/wordpress-seo/