Stylesheet load error: An unknown error has occurred (805303f4) http://www.domain.com/wp-content/plugins/google-sitemap-generator/sitemap.xsl
Hi folks.I publish a small solution for you.

Open your web folder and delete file.

/wp-content/plugins/google-sitemap-generator/

Now delete sitemap.xsl

Open your domain/sitemap.xml,

Have a nice day.