How to pull element from xml?

Question

PHP

I'm trying to extract the date from the xml of the Central Bank of the Russian Federation.
Everything is available at the link itself: TYK

<?
$xml = new DOMDocument();
$date = @$xml->load('http://www.cbr.ru/scripts/XML_daily.asp?date_req=' . date('d/m/Y'));
$root = $date->documentElement;
$valcurs = $root->getElementsByTagName('ValCurs');
echo $valcurs->item(0)->getAttribute('Date');
?>

I get the following->

Fatal error: Uncaught Error: Call to a member function getElementsByTagName() on null in C:\Users\Decay\Desktop\public_html\test\load.php:12 Stack trace: #0 {main} thrown in C:\Users\Decay\Desktop\public_html\test\load.php on line 12

Where is the mistake?