Empty <loc> tags in sitemap

[MikeA]

Hi!
I realized that I'm getting a few entries with empty <loc> tags like these:

  <url>
       <loc></loc>
       <lastmod>2013-10-01T02:47:12+00:00</lastmod>
       <changefreq>daily</changefreq>
       <priority>1.0000</priority>
  </url>

About 3 entries with empty <loc> from 6500 aprox. sitemap generated urls. Google is notifying me about this error.

Can you please check this out?
Thanks.

[XML-Sitemaps Support]

Hello,

please check that you have "use temporary files" setting disabled, that could be the reason.

[MikeA]

Thanks a lot.
Followed you hint:  Uncheck "use temporary files" and it is now working. 
Regards.