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MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1055 - Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'KL1316201.p.view' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
SELECT c.ID_CAT, c.title, p.view, c.roworder, c.description, c.image, c.filename, c.redirect, c.total, l.ID_PICTURE, l.title pictitle, l.date, m.uid, m.username, mg.namestyle FROM mybb_gallery_cat AS c LEFT JOIN mybb_gallery_catperm AS p ON (p.ID_GROUP = 1 AND c.ID_CAT = p.ID_CAT) LEFT JOIN mybb_gallery_pic AS l ON (c.LAST_ID_PICTURE = l.ID_PICTURE) LEFT JOIN mybb_users AS m ON (m.uid = l.ID_MEMBER) LEFT JOIN mybb_usergroups AS mg ON (m.usergroup = mg.gid) WHERE c.ID_PARENT = 0 GROUP BY c.ID_CAT ORDER BY c.roworder ASC