Infinite SEO Sitemap Generated, but not found by Google WM Tools.

Infinite SEO Sitemap Generated, but not found by Google WM Tools.

Thinkhandy.com is my main site in a multisite installation. All plugins, themes, and WP are at their most current versions.

I can see my sitemap generated by infinite seo just fine. See it here: http://thinkhandy.com/sitemap.xml

Google webmaster tools sitemap tool cannot see it. It gets this error:
"
We encountered an error while trying to access your Sitemap. Please ensure your Sitemap follows our guidelines and can be accessed at the location you provided and then resubmit.
1
General HTTP error: 404 not found
HTTP Error: 404
-
Aug 8, 2012
"

Anyone have any ideas?