Google wont accept sitemap

I can access sitemap.index.xml.gz and sitemap_1.xml.gz when I type them in my browser. Google can read sitemap.index.xml.gz but report a 404 for sitemap.index_1.xml.gz

RewriteCond %{REQUEST_URI} !(admincp/|modcp/|cron)
to
RewriteCond %{REQUEST_URI} !(admincp/|modcp/|cron|bvseo_sitemap/)
worked

FYI, this worked for me too. It seems that it started failing a couple days ago (no changes made on my side to the SEO or host or anything). I just tried to access the URL directly and got the same 404 error. Thanks!