My sitemap is located here:
http://studentpulse.com/sitemap-news
Was working fine. However, I published an article today which had a special character in the title (accidentally) -- this broke the sitemap, then when I fixed it, that error went away and now I am getting "Unsupported sitemap format." I've checked out the guidelines for the new format and I don't notice anything wrong with mine.
Any ideas?