메인에서 admin 으로 접속해서 관리자모드 들어가면

http://roy04.net/bbs/group.php?gr_id=roy

아래와 같이 에러메시지가 나오는데 뭐가 잘못된건지요..
제로보드에서 그누보드로 처음작업하다보니 모르는게 많네요...ㅜㅜ
기존 올라온 글도 다 확인하고 있는데.. 도와주세요

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/aptopic1/www/head.php:1) in /home/hosting_users/aptopic1/www/head.sub.php on line 32

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/aptopic1/www/head.php:1) in /home/hosting_users/aptopic1/www/head.sub.php on line 34

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/aptopic1/www/head.php:1) in /home/hosting_users/aptopic1/www/head.sub.php on line 35

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/aptopic1/www/head.php:1) in /home/hosting_users/aptopic1/www/head.sub.php on line 36

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/aptopic1/www/head.php:1) in /home/hosting_users/aptopic1/www/head.sub.php on line 37

Warning: Cannot modify header information - headers already sent by (output started at /home/hosting_users/aptopic1/www/head.php:1) in /home/hosting_users/aptopic1/www/head.sub.php on line 38