I installed the plugin, activated it, created a page with this content:
When I go to the page, I get the following message, and no sitemap:
Warning: extract() [function.extract]: First argument should be an array in /mnt/sunfire/hjemmesider/servicongroup/www/wp-content/plugins/wp-realtime-sitemap/wp-realtime-sitemap.php on line 1565
Sitemap created with WP Realtime Sitemap.
Also the admin throws a lot of similar PHP warnings.