google says sitemap is empty but it isn't

[account2]

when I run the Standalone XML Sitemap Generator everything seems to work okay, the sitemap.xml is generated and I can see the URL's, but when I try to add it to google webmaster, I get an error: Empty Sitemap
Your Sitemap does not contain any URLs. Please validate and resubmit your Sitemap.

but I can see it's not empty.

does anybody know why I get this error?

Here's some of the output:

<?xml version="1.0" encoding="UTF-8"?>
<urlset
      xmlns="[external links are visible to admins only]"
      xmlns:xsi="[external links are visible to admins only]"
      xsi:schemaLocation="
            [external links are visible to admins only]
            [external links are visible to admins only]">
<!-- created with Standalone Sitemap Generator www.xml-sitemaps.com (16582) -->

  <url>
       <loc>[external links are visible to admins only]</loc>
       <lastmod>2009-08-13T06:16:39+00:00</lastmod>
       <changefreq>daily</changefreq>
       <priority>0.5000</priority>
  </url>
  <url>
       <loc>[external links are visible to admins only]</loc>
       <lastmod>2009-08-13T06:16:39+00:00</lastmod>
       <changefreq>daily</changefreq>
       <priority>0.4000</priority>
  </url>

[XML-Sitemaps Support]

Hello,

what is the sitemap URL you submit?

[account2]

it's
[external links are visible to admins only]

when I donwload the file I can see the sites listed....

[XML-Sitemaps Support]

Hello,

it opens as empty file for me, please try to reupload sitemap.xml.