URGENT parsing xml file using codeigniter?

[eluser]harper23[/eluser]
sorry if I bother you, but I keep gettin the same error, please can you help me?

in this function, the line that is in black, I put all the directory where is my xml, but the error keep going :

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: myxml

Filename: controllers/welcome.php

Line Number: 45

sorry if is a stupid question


function _getXML($fname)
{

$filename = $fname.'.xml';
$xmlfile="C:\Users\beto\Documents\xml".$filename;
$xmlRaw = file_get_contents($xmlfile);

$this->load->library('simplexml');
$xmlData = $this->simplexml->xml_parse($xmlRaw);

foreach($xmlData['Emisor'] as $row)
{

$result .= '<tr>';
$result .= '<td>'.$row['id'].'</td>';
$result .= '<td>'.$row['name'].'</td>';
$result .= '<td>'.$row['category'].'</td>';
$result .= '<td>$ '.$row['price'].'</td>';
$result .= '</tr>';

}
return $result;
}