Token invalid Travian when call from curl - php

Question

I try to Exchange silver to gold but i got error message:
{"response": {"error":true,"errorMsg":"Token invalid","data":[]}}
The token is right but i don't know way this error can you help me to fixed
$url ='http://ts1.travian.com/dorf1.php';
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_NOBODY, false);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_COOKIEFILE,$dir . '/cookie.txt');
curl_setopt($ch, CURLOPT_COOKIE, "cookiename=0");
curl_setopt($ch, CURLOPT_USERAGENT,"Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_REFERER, $_SERVER['REQUEST_URI']);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
$response = curl_exec($ch);
preg_match("/ajaxToken = '(.*?)'/s", $response, $s3);
$url ='http://ts1.travian.com/ajax.php?cmd=silverExchange';
$data = array('cmd'=>'silverExchange','exTyp'=>'SilverToGold','s' =>'200','g'=>'1','ajaxToken'=>$s3[1]);
$data_json = json_encode($data);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_exec($ch);