Ahh, I see the issue, not the mappers fault. Your host (wirenine) is preventing you from allocating a certain amount of memory.. If you look at your page source for your request you will see the following:
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="
www.google.com/schemas/sitemap/0.84">
<br />
<b>Fatal error</b>: Allowed memory size of 16777216 bytes exhausted (tried to allocate 7400 bytes) in <b>/home/ferrazf/public_html/components/com_sef/sef_ext.php</b> on line <b>184</b><br />