Fatal error: Uncaught Error: 해결방법 찾습니다 ㅠ

고수님들ㅠ 아래 에러코드 해결방법좀 문의드립니다..!!

특정 게시글 클릭 시

Fatal error: Uncaught Error: Call to undefined function conv_subject() in /home1/sdcunion/bbs/board.php:141 Stack trace: #0 {main} thrown in /home1/sdcunion/bbs/board.php on line 141

>>>>>>/home1/sdcunion/bbs/board.php on line 141 따라가보면 아래와 같습니다

 $g5['title'] = strip_tags(conv_subject($write['wr_subject'], 255))." > ".$g5['board_title'];

관리자 모드 진입하려고 클릭하면

Fatal error: Uncaught Error: Call to undefined function conv_subject() in /home1/sdcunion/adm/eyoom_admin/admin.common.php:115 Stack trace: #0 /home1/sdcunion/adm/eyoom_admin/index.php(20): include_once() #1 /home1/sdcunion/eyoom/common.php(188): include_once('/home1/sdcunion...') #2 /home1/sdcunion/extend/xeyoom.extend.php(53): include_once('/home1/sdcunion...') #3 /home1/sdcunion/common.php(759): include_once('/home1/sdcunion...') #4 /home1/sdcunion/adm/_common.php(3): include_once('/home1/sdcunion...') #5 /home1/sdcunion/adm/index.php(3): include_once('/home1/sdcunion...') #6 {main} thrown in /home1/sdcunion/adm/eyoom_admin/admin.common.php on line 115

>>>>  /home1/sdcunion/adm/eyoom_admin/admin.common.php on line 115 찾아가보면 아래와 같습니다

$new_post[$i]['subject']    = $comment . conv_subject($row2['wr_subject'], 100);