등록자 홈페이지등록자 다른매물

에러쿼리보고 : /jiib_view.html?PB_1207234896=2&SI_F_U_first=asc&article_num=921414&category_1=A&category_3=11
select * from TCBOARD_msg_recv where TCBOARD_msg_recv.is_view<>'N' and (TCBOARD_msg_recv.u_viewer like '%;;%') and u_viewer like '%%' and (open_date=0 or open_date='') order by U_first asc
Unknown column 'U_first' in 'order clause'