simplexml_load_string fejl hvorfor?

Kode 

<?php

//Creates XML string and XML document using the DOM
$dom = new DomDocument('1.0');

//add root - <profiler>
$profiler = $dom->appendChild($dom->createElement('profiler'));

//add <profil> element to <profiler>
$profil = $profiler->appendChild($dom->createElement('profil'));

//add <navn> element to <profil>
$navn = $profil->appendChild($dom->createElement('navn'));

//add <navn> text node element to <navn>
$navn->appendChild(
			$dom->createTextNode('Bo'));

	
//generate xml
$dom->formatOutput = true; //set the formatOutput attribute of domDocument to true

//save XML as string or file
$test1 = $dom->saveXML(); //put string in eksempel1
$dom->save('test1.xml'); //save as file
?>

<?php

$sxe = simplexml_load_string('<profiler><profil><navn>'.'Bo</navn></profil></profiler>');

if ($sxe==false) {
	echo 'Error while parsing the document';
	exit;
}

$dom_sxe = dom_import_simplexml($sxe);
if(!dom_sxe) {
	echo 'Error while converting XML';
	exit;
}

$dom = new DOMDocument('1.0');
$dom_sxe = $dom->importNode($dom_sxe, true);
$dom_sxe = $dom->appendChild($dom_sxe);

echo $dom->save('test2.xml');

?>