<?php 
$hotfile_user = "hotfileusername"; 
$hotfile_pass = "hotfilesifre"; 

  
$ch = curl_init(); 
curl_setopt($ch , CURLOPT_TIMEOUT, 180); 
curl_setopt($ch , CURLOPT_RETURNTRANSFER , TRUE); 
curl_setopt($ch , CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; tr; rv:1.9.2) Gecko/20100115 Firefox/3.6'); 
curl_setopt($ch , CURLOPT_COOKIEJAR, 'cookie.txt'); 
curl_setopt($ch , CURLOPT_COOKIEFILE, 'cookie.txt'); 
curl_setopt($ch , CURLOPT_FOLLOWLOCATION, TRUE); 
curl_setopt($ch , CURLOPT_URL, 'http://hotfile.com/login.php'); 
curl_setopt($ch , CURLOPT_POST , TRUE); 
curl_setopt($ch , CURLOPT_POSTFIELDS, 'user='.$hotfile_user.'&pass='.$hotfile_pass); 
echo $exec = curl_exec($ch); 

?>

Yukardaki kod ile hotfile ye login olucam. Ama maalesef çalıştırdığımda kodu

Notice: Undefined index: returnto in /hotfile/www/root/login.php on line 21

Notice: Undefined index: returnto in /hotfile/www/root/login.php on line 22

Notice: Undefined index: returnto in /hotfile/www/root/login.php on line 23

böyle hata veriyor. acaba nedeni nedir ?