What is my mistake? (script)

$arrSetHeaders = array(
"User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 YaBrowser/17.11.1.988 Yowser/2.5 Safari/537.36",
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
"Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3",
"Accept-Encoding: gzip, deflate"
);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, 'https://instayildizi.com/instalogin?');
curl_setopt($curl, CURLOPT_COOKIEJAR, 'cooki.txt');
curl_setopt($curl, CURLOPT_COOKIEFILE, 'cooki.txt');
curl_setopt($curl, CURLOPT_HTTPHEADER, $arrSetHeaders);
curl_setopt($curl,CURLOPT_ENCODING , "gzip");
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl,CURLOPT_POST,1);
curl_setopt($curl,CURLOPT_POSTFIELDS, "username=".$login."&password=".$pass."&csrfmiddlewaretoken=".$key
$html = curl_exec($curl);
curl_close($curl);
pre($html);