select wr_id, wr_subject, wr_datetime from g5_write_c20bm9b19t3kar6dzjh8ycicy5v_b where wr_is_comment = 0 and wr_num = '-9' and wr_reply < '' and ((INSTR(LOWER(mb_id2c1), LOWER('gd3700'))) ) order by wr_num desc, wr_reply desc limit 1

1054 : Unknown column 'mb_id2c1' in 'where clause'

error file : /bbs/board.php