Google can't read XML sitemap

[dtwsolutions]

Thanks for the reply! That directory is already 777. When I click the button to build the sitemap, I see the timestamp update for the vbulletin_sitemap_index.xml.gz file that is in that directory. So...

[dtwsolutions]

My client's VB forum is running the latest version, but we can not get the XML sitemap to be loaded in Google. It says "Sitemap index has errors" then has:

This required tag is...

[dtwsolutions]

I have a client that has just upgraded to VB 5.3 and since doing so, the module we built for Joomla that displays popular forum threads doesn't work. We've addressed the database changes and have that...