SELECT COUNT(DISTINCT `wr_parent`) AS `cnt` FROM g5_write_c20bm9b19t3kar6dzjh8ycicy5v_b WHERE (1) and ((INSTR(LOWER(mb_id2c1), LOWER('gd3700'))) ) and (wr_num between -20 and (-20 + 10000))

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

error file : /bbs/board.php