webriot on "[Plugin: WordPress SEO by Yoast] page-sitemap.xml : page not found"

# 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

I put that in my .htacess and everything started to work fine.

Found this solution from this thread:
http://wordpress.org/support/topic/plugin-wordpress-seo-by-yoast-xml-sitemap-missing