A Database Error Occurred

Error Number: 1055

Expression #9 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'ledinside2014.file.thumb' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT `tw_illumination`.`lid`, `tw_illumination`.`tid`, `tw_illumination`.`title`, `tw_illumination`.`status`, `tw_illumination`.`body`, `tw_illumination`.`totalcount`, `tw_illumination`.`timestamp`, max(file.timestamp), `file`.`thumb`, `user`.`name` as creator FROM (`tw_illumination`) LEFT JOIN `tw_illumination_files` as file ON `tw_illumination`.`lid`=`file`.`lid` LEFT JOIN `shared_users` as user ON `tw_illumination`.`uid`=`user`.`uid` WHERE `tw_illumination`.`status` = 1 AND `tid` = '3' GROUP BY `tw_illumination`.`lid` ORDER BY `tw_illumination`.`timestamp` desc LIMIT 30