ปัญหา GROUP BY Mssql error invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. (severity 16)

$s_select_car = "SELECT total.gps_lat, total.gps_lng, total.gps_imei, total.gps_time_send, u.login_username ,u.drive_code,u.imei FROM tb_gps_user AS u,tb_gps_total AS total WHERE u.imei=total.gps_imei GROUP BY total.gps_lat, total.gps_lng ";
$r_select_car = mssql_query($s_select_car);
$check_data  = mssql_num_rows($r_select_car);