Warning: ftp_put(): Opening data connection for newo.txt. in C:\Inetpub\wwwroot\_hq\d

sorry guys its.."newo.txt"

i am having a problem while uploading a file to ftp server ,its showing a warning :
Warning: ftp_put(): Opening data connection for newo.txt. in C:\Inetpub\wwwroot\_hq\demo\upload.php on line 15

though i am able to create the directories ,but not able to upload the files

<?php
$ftp_server="172.16.0.55";
$ftp_user_name='test';
$ftp_user_pass='test';
$src = $_FILES['filename']['tmp_name'];
$conn_id = ftp_connect($ftp_server); $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
ftp_mkdir($conn_id,$campaign_name);
ftp_chdir($conn_id,$campaign_name);
file_name='newo.txt';//renaming the file
$upload = ftp_put($conn_id,$file_name,$src,FTP_BINARY);
?>

Does anyone have any idea...

please help me out,if u need more information please ask....

buddinghere.