MySQL query error: file - , line -

SELECT a.r_name,b.enable,b.bots,a.r_id, COUNT(*) as kv FROM sewc_li_razdel a,sewc_li_link_info b,sewc_li_back_link c WHERE a.r_id=b.r_id AND c.id=b.id AND c.s_id=1 AND b.enable=1 GROUP BY b.r_id

Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'sewc_ru.b.bots' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by