解析rss XML错误:格式不正确

我想为我的网站建立一个rss提要当我运行rss页面时，我得到这个错误:

XML解析错误:not well-formedhttp://localhost/projects_rss.php第一行，第二列:

这是我的代码或者至少是它的XML部分

foreach($projects_array as $projects_array){    
    $parr[]= array(
      'title' =>  (string)$projects_array->title,
      'description'  =>  (string)$projects_array->text,
      'link'  =>  (string)'www.imjobs.com/project.php?project='.$projects_array->id ,
      'date'  =>  (string) date("D, d M Y H:i:s O", $projects_array->datee),
      );
}
header("Content-Type: text/xml;charset=iso-8859-1");
    echo '<?xml version="1.0" encoding="ISO-8859-1"?>
    <rss version="2.0">
    <channel>
    <link>http://www.mysite.com</link>
    <language>en-us</language>
    <copyright>Copyright (C) 2011 mimjobs.com</copyright>
    <pubDate>' . date("D, d M Y H:i:s O", time()) . '</pubDate>';
    foreach ($parr as $p ){
    echo '<item>';
    echo '<title>' . $p['title'] . '</title>';
    echo '<description>'.$p['description'].'</description>';
    echo '<link>' . $p['link'] . '</link>';
    echo '<pubDate>' . $date . '</pubDate>';
    echo '</item>';
    }
    echo '</channel>';
    echo '</rss>';
    ?>