MySQL Error Occured
1054: Unknown column 'rs_visibility' in 'where clause'

QUERY = SELECT 'act' AS rs_feed, 'Actions' AS rs_type, gac_title AS rs_title, gac_visibility AS rs_visibility, 'actions.php?action=show&gaid' AS rs_link, gac_id AS rs_id, gac_created AS rs_created, DATE_FORMAT(gac_created, "%d-%b-%Y") AS rs_created_stamp, u1.u_firstname AS rs_firstname, u1.u_lastname AS rs_lastname, CONCAT(gac_id,'/',gac_fn1) AS rs_doclink, gac_sx1 AS rs_doctype, DATE_FORMAT(gac_date,'%d-%b-%Y') AS rs_data1, gac_assigned AS rs_data2, concat(u2.u_firstname,' ',u2.u_lastname) AS rs_data3 FROM ((g_action left join ph_userinfo u1 on gac_created_by = u1.u_alias) left join ph_userinfo u2 ON gac_assigned = u2.u_userid) WHERE gac_project = "471" AND rs_visibility >= "40" ORDER BY rs_created DESC