MySQL error in file: W:\eee3.ru\index.php at line 21

Expression #4 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.so.idate' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

select SQL_CALC_FOUND_ROWS name, ( max(word in ('ен')) + max(word in ('от')) ) as R, sum(weight) as W, idate, id_obj from search_object as so, search_index as i where so.id = i.id_obj and word in ('ен', 'от') group by name order by R desc, W desc, idate desc limit 0, 10