select wr_id, wr_subject from g4_write_qa where wr_is_comment = 0 and wr_num = '-2723' and wr_reply < '' and ((INSTR(LOWER(mb_id2C1), LOWER('doolee09'))) ) order by wr_num desc, wr_reply desc limit 1

1054 : Unknown column 'mb_id2C1' in 'where clause'

error file : /bbs/board.php