rcpkrc on "[Plugin: WordPress SEO by Yoast] Yoast WordPress SEO:XML Sitemaps with big data"

Hello.
l have a news portal with more than 200.000 articles inside it.
l was using better website sitemap but after some trouble l wanted to test Yoast WordPress SEO:XML Sitemaps,
l devided sitemaps into parts with 5000 posts in each.
but its still not working....
http://sondakika.net.tr/sitemap_index.xml

http://wordpress.org/extend/plugins/wordpress-seo/