Sitemap Compression error

Hey im getting the following error from google sitemap. How do i fix this?
I have deleted the data folder and regenerated the sitemap and re-submitted but still geting the error message. thanks


Errors

Compression error
Error with Sitemap compression. Please recompress the file and resubmit. [?] Date found: Jun 29, 2007

Total number of Sitemaps listed in this Index file: 9

The following Sitemaps listed by this Sitemap Index file have errors. [?]
Sitemaps View errors for: http://www.networktemple.com/sitemap_4.xml.gz Errors View errors for: http://www.networktemple.com/sitemap_5.xml.gz Errors View errors for: http://www.networktemple.com/sitemap_6.xml.gz Errors View errors for: http://www.networktemple.com/sitemap_7.xml.gz Errors View errors for: http://www.networktemple.com/sitemap_8.xml.gz Errors

i think i fixed, 2 x scheduled tasks.. i removed the old one and regenerated the sitemap.. seems to fix it.,