unfortunally google could not read my sitemap

this is how it looks like
Code:
<?php
$lastmod = date('Y-m-d');
$header .= "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
$header .= "<urlset xmlns=\"http://www.google.com/schemas/sitemap/0.84\"
xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"
xsi:schemaLocation=\"http://www.google.com/schemas/sitemap/0.84
http://www.google.com/schemas/sitemap/0.84/sitemap.xsd\">";
echo $header;
?>
<url>
<loc>http://www.hentaiprince/</loc>
<lastmod><? echo $lastmod; ?></lastmod>
<changefreq>hourly</changefreq>
<priority>0.9</priority>
</url>
... and so on
</urlset>