오류가 나는곳의 주소를 알려주시면 더 빠르고 정확하게 답변 받을 수 있습니다.

오류 주소 : http://univerclub.net/new/board/main.php

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/atple/www/new/board/main.php:5) in /home/hosting_users/atple/www/new/board/lib/common.lib.php on line 109

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/atple/www/new/board/main.php:5) in /home/hosting_users/atple/www/new/board/lib/common.lib.php on line 109

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/atple/www/new/board/main.php:5) in /home/hosting_users/atple/www/new/board/lib/common.lib.php on line 109

이런에러인데요...

왜이런걸까요...
common.lib.php on line 109은

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


-----------------희한하게 새로고침을 하면 또 멀쩡하게 나와요....-------------------------
왜이런걸까요,,,