<?php
$today=date("Ymd");
$metrika_url = 'https://api-metrika.yandex.ru/stat/v1/data?preset=traffic&metrics=ym:s:pageviews& id=xxxx xxxxxx&date1=31daysAgo&date2=today&group=year&oauth_token=xxxxxxxxxxxxxx';
$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL,$metrika_url);
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6");
curl_setopt ($ch, CURLOPT_TIMEOUT, 60);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
$metrika = curl_exec ($ch);
curl_close($ch);
$metrika_o = json_decode($metrika);
echo "<br>";
echo " ".$metrika_o->totals->pageviews;
?>
В итоге пустое поле. Помогите, пожалуйста, найти ошибку