Google Sitemap Non-Specific Error

Question

Google's Webmaster Tools gives me the following status about my sitemap, but there is no specific error. The XML seems to be valid. Any ideas?

URLs in Sitemap: Total: 7, Indexed: 6  
Submitted: Feb 14, 2010 – Error 
Downloaded: Feb 14, 2010

Sitemap errors and warnings

Line: - 
Status: 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.   
Details: Problem detected on: Feb 14, 2010

Actual sitemap: http://www.beechtreetech.com/google-site-map.html

Answer 1

Your server claims the file contains text/html, which it doesn't. Google is probably expecting application/xml.