이전후에 위에 이런 오류가 뜬미다 ㅠㅠ

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

오류 주소 : Warning: include_once(./data/config/default.php) [function.include-once]: failed to open stream: No such file or directory in D:\www\yiwuplus\common.php on line 294

Warning: include_once() [function.include]: Failed opening './data/config/default.php' for inclusion (include_path='.') in D:\www\yiwuplus\common.php on line 294

Warning: Cannot modify header information - headers already sent by (output started at D:\www\yiwuplus\common.php:294) in D:\www\yiwuplus\lib\common.lib.php on line 98

Warning: Cannot modify header information - headers already sent by (output started at D:\www\yiwuplus\common.php:294) in D:\www\yiwuplus\head.sub.php on line 32

Warning: Cannot modify header information - headers already sent by (output started at D:\www\yiwuplus\common.php:294) in D:\www\yiwuplus\head.sub.php on line 34

Warning: Cannot modify header information - headers already sent by (output started at D:\www\yiwuplus\common.php:294) in D:\www\yiwuplus\head.sub.php on line 35

Warning: Cannot modify header information - headers already sent by (output started at D:\www\yiwuplus\common.php:294) in D:\www\yiwuplus\head.sub.php on line 36

Warning: Cannot modify header information - headers already sent by (output started at D:\www\yiwuplus\common.php:294) in D:\www\yiwuplus\head.sub.php on line 37

Warning: Cannot modify header information - headers already sent by (output started at D:\www\yiwuplus\common.php:294) in D:\www\yiwuplus\head.sub.php on line 38