String could not be parsed as XML

$requestAddress = "http://www.aaa.ru";
$xml_str = file_get_contents($requestAddress,0);
$xml = new SimplexmlElement($xml_str);

выдаёт ошибку String could not be parsed as XML
Как быть?
Спасибо

 

там 100-пудовый xml

 

вот там какая хрень
Полный текст фрагмента
<?php
function getWeather() {
$requestAddress = "http://www.google.com/ig/api?weather=челябинск&hl=ru";
$xml_str = file_get_contents($requestAddress,0);
XML $xml = new SimplexmlElement($xml_str);
$count = 0;
echo '<div id="weather">';
foreach($xml->weather as $item) {
foreach($item->forecast_conditions as $new) {
echo '<div class="weatherIcon">';
echo '<img src="http://www.google.com/' .$new->icon['data'] . '"/><br/>';
echo $new->day_of_week['data'];
echo '</div>'; } }
echo '</div>';}
getWeather();
?>

а по адресу http://www.google.com/ig/api?weather=челябинск&hl=ru

лежит

<xml_api_reply version="1"> <weather module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1" row="0" section="0"> <forecast_information> <city data="Chelyabinsk, Province of Chelyabinsk"/> <postal_code data="челябинск"/> <latitude_e6 data=""/> <longitude_e6 data=""/> <forecast_date data="2010-02-10"/> <current_date_time data="2010-02-10 08:00:00 +0000"/> <unit_system data="US"/> </forecast_information> <current_conditions> <condition data="Cloudy"/> <temp_f data="-13"/> <temp_c data="-25"/> <humidity data="Humidity: 73%"/> <icon data="/ig/images/weather/cloudy.gif"/> <wind_condition data="Wind: SE at 4 mph"/> </current_conditions> <forecast_conditions> <day_of_week data="Wed"/> <low data="-17"/> <high data="2"/> <icon data="/ig/images/weather/mostly_sunny.gif"/> <condition data="Mostly Sunny"/> </forecast_conditions> <forecast_conditions> <day_of_week data="Thu"/> <low data="-1"/> <high data="12"/> <icon data="/ig/images/weather/cloudy.gif"/> <condition data="Cloudy"/> </forecast_conditions> <forecast_conditions> <day_of_week data="Fri"/> <low data="5"/> <high data="18"/> <icon data="/ig/images/weather/mostly_sunny.gif"/> <condition data="Partly Sunny"/> </forecast_conditions> <forecast_conditions> <day_of_week data="Sat"/> <low data="6"/> <high data="27"/> <icon data="/ig/images/weather/mostly_sunny.gif"/> <condition data="Partly Sunny"/> </forecast_conditions> </weather></xml_api_reply>