Warning: Cannot modify header information - headers already sent by (output started at /home/hansir/Crazyhuman/lib/common.lib.php:1258) in /home/hansir/Crazyhuman/lib/common.lib.php on line 109

Warning: Cannot modify header information - headers already sent by (output started at /home/hansir/Crazyhuman/lib/common.lib.php:1258) in /home/hansir/Crazyhuman/lib/common.lib.php on line 109

Warning: Cannot modify header information - headers already sent by (output started at /home/hansir/Crazyhuman/lib/common.lib.php:1258) in /home/hansir/Crazyhuman/lib/common.lib.php on line 109

이런 오류메시지와 관련되어 질문드립니다.
검색하면 몇개의 질문이 있습니다만, 정확한 답변이 없어서 질문드립니다.

common_lib.php 109줄과 관련된 부분..

// 쿠키변수 생성
function set_cookie($cookie_name, $value, $expire)
{
global $g4;

setcookie(md5($cookie_name), base64_encode($value), $g4[server_time] + $expire, '/', $g4[cookie_domain]);
}


[setcookie(md5($cookie_name), base64_encode($value), $g4[server_time] + $expire, '/', $g4[cookie_domain]);] 이부분이 109줄에 있는 부분입니다.

뭐때문인지..