cant get the rss to work as valid feed

cant get the rss to work as valid feed

so everything seems to be fine
this is the address
http://mimjob.com/news/rss
this is the source
<?php ob_start(); echo'<?xml version="1.0" encoding="utf-8" ?>' . "\n"; ?>
<rss version="2.0"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
xmlns:admin="http://webns.net/mvcb/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:content="http://purl.org/rss/1.0/modules/content/">
<channel>
<title><?php echo $feed_name; ?> </title>
<link><?php echo $feed_url; ?> </link>
<description><?php echo $page_description; ?></description>
<dc:language><?php echo $page_language; ?></dc:language>
<dc:creator><?php echo $creator_email; ?></dc:creator>
<dc:rights>Copyright <?php echo gmdate("Y", time()); ?></dc:rights>
<admin:generatorAgent rdf:resource="http://www.mzksh.com/" />
<?php foreach($news->result() as $n): ?>
<item>
<title><?php echo xml_convert($n->title); ?></title>
<link><?php echo base_url('news/get/' . $n->id) ?></link>
<guid><?php echo base_url('news/get/' . $n->id) ?></guid>
<description><![CDATA[<?php echo
character_limiter($n->text, 200); ?>]]></description>
<pubDate><?php echo $n->date;?></pubDate>
</item>
<?php endforeach; ?>
</admin:generatoragent>
</channel>
</rss>
<?php
$output = ob_get_contents();
ob_end_clean();
echo $output;
?>
ive added the ob_start to remove empty spaces but still cant get it to
work and no , there is no white space befor
i'm using codeigniter framework but i don't think that's relevant