XML Sitemap does not list any URLs

When using the XML sitemap module, my sitemap does not list any URLs.

I have looked at the issue queue, and as this is a new installation, and my first sitemap for this site, I cannot find the same issue or resolution. (I am not trying to replicate a previous sitemap like this issue: http://drupal.org/node/458546 ).

I originally installed version 6.x-1.0-beta3, but after that did not list any URLs and I read the issues queue I un-installed it, then installed the latest version of 6.x-1.0-beta5.

This is what I get listed on my sitemap page (http://www.example.com/?q=sitemap.xml - note I do not have clean URLs):

  <?xml version="1.0" encoding="UTF-8" ?>
- <sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
- <sitemap>
  <loc>http://www.example.com/?q=sitemap-0.xml</loc>
  </sitemap>
- <sitemap>
  <loc>http://www.example.com/?q=sitemap-1.xml</loc>
  </sitemap>
  </sitemapindex>

Google Webmaster Tools confirms that the “Total URLs in Sitemap = 0”. Webmaster Tools also reports this error:

Unsupported file format
Your Sitemap does not appear to be in a supported format. Please ensure it meets our Sitemap guidelines and resubmit.

I have run cron about 6 times over the last 48 hours with no effect. Plus when I Update The Cache I get lots of error messages about my backup, plus the below 2 errors:

    * user warning: Table 'simplenu_drp01.drup_xmlsitemap_taxonomy' doesn't exist query: SELECT t.*, v.module FROM drup_term_data t INNER JOIN drup_vocabulary v ON v.vid = t.vid LEFT JOIN drup_xmlsitemap_taxonomy xt ON xt.pdata = t.tid WHERE xt.pdata IS NULL ORDER BY v.weight ASC, t.weight ASC LIMIT 0, 200 in /home1/simplenu/public_html/modules/xmlsitemap/xmlsitemap_taxonomy/xmlsitemap_taxonomy.module on line 24.

    * user warning: Table 'simplenu_drp01.drup_xmlsitemap_taxonomy' doesn't exist query: SELECT COUNT(*) FROM drup_xmlsitemap_taxonomy WHERE status = 1 AND (priority_override = -2 OR priority_override >= 0) in /home1/simplenu/public_html/modules/xmlsitemap/xmlsitemap_taxonomy/xmlsitemap_taxonomy.module on line 187.

I am a Drupal newbie. Please can you offer any advice of how I can get URLs in my sitemap?

Thanks