On checking the Site Map Generator when I checked it, I got the following error:
Trying to ping: http://www.google.com/webmasters/sitemaps/ping?sitemap=http%3A%2F%2Fwww.creative-i.info%2Fsitemap.xml.gz. The sections below should give you an idea whats going on.
Errors, Warnings, Notices:
WP_DEBUG was set to false somewhere before. You might not see all debug information until you remove this declaration!
Notice: WP HTTP API Web Request failed: couldn't connect to host in /home/creative/public_html/wp-content/plugins/google-sitemap-generator/sitemap-core.php on line 2373
Result (text only):