Unable to Determine Parse Mode!

The validator can process documents either as XML (for document types such as XHTML, SVG, etc.) or SGML (for HTML 4.01 and prior versions). For this document, the information available was not sufficient to determine the parsing mode unambiguously, because:

    * the MIME Media Type (text/html) can be used for XML or SGML document types
    * No known Document Type could be detected
    * No XML declaration (e.g <?xml version="1.0"?>) could be found at the beginning of the document.
    * No XML namespace (e.g <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">) could be found at the root of the document.

As a default, the validator is falling back to SGML mode.
Maddelemişler gerçi ama ne yaptıysam çözemedim...

Header.php dosyamın ilk satırları şunlar;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://gmpg.org/xfn/11">
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
<meta name="distribution" content="global" />
<meta name="robots" content="follow, all" />
<meta name="language" content="tr, en" />
<title>Title...</title>
<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="<?php bloginfo('rss2_url'); ?>" />
<link rel="alternate" type="text/xml" title="RSS .92" href="<?php bloginfo('rss_url'); ?>" />
<link rel="alternate" type="application/atom+xml" title="Atom 0.3" href="<?php bloginfo('atom_url'); ?>" />
<link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />
<?php wp_head(); ?>
<style type="text/css" media="screen"><!-- @import url( <?php bloginfo('stylesheet_url'); ?> ); --></style>
</head>
<body>
Yardımlarınız/önerileriniz için şimdiden teşekkür ederim.