Error Google news sitemap

[deta.frank]

Hi I bought sitemap generator but I'v error when upload sitemap-news.xml. This is the message (i'm italian): the sitemap loaded is not a supported format. How i can do? I use wordpress

[XML-Sitemaps Support]

Hello,

what is your sitemap URL?

[deta.frank]

this is the link [ External links are visible to forum administrators only ]. The generator dont' add new post to this file!

[XML-Sitemaps Support]

Hello,

it doesn't look like sitemap file created by our sitemap generator, try to regenerate sitemap.