Error on accessing mysite.com/sitemap.xml.gz

Hello,

By accessing the following url it works fine:
http://mywebsite.com/sitemap.xml

By accessing the following url:
http://mywebsite.com/sitemap.xml.gz

I get the following error message in a blank page:
++++start
XML Parsing Error: not well-formed
Location: http://intelstyle.com/sitemap.xml.gz
Line Number 1, Column 1:
++++end

Thanks,
Autovall

http://ww.wp.xz.cn/plugins/google-sitemap-generator/