If you come across this error when trying to view your XML sitemap using your browser don’t fret. Mainly it appears the error is with the Google XML Sitemaps plugin. Here is the error:
Error loading stylesheet: An unknown error has occurred (805303f4)
Solution for this XML sitemap error:
This one’s a quick fix, if you can call it that. I don’t think it’s really an actual error that would harm anything, however when comparing the browser input URL with the URL in the erorr, you can see it has something to do with the www or non-www in front of the URL.
All I needed to do was enter the URL without the “www” in front and it loaded the sitemap fine. Now I can view it through the browser to verify there were no errors with the sitemap before Google Webmaster submission!