error on blog section after install

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Hi all,

i get the following error after installing a clean copy of concrete on my own private server.

An exception occurred while executing 'SELECT date_format(cv.cvDatePublic, "%Y") as navYear, date_format(cv.cvDatePublic, "%m") as navMonth FROM Pages p LEFT JOIN PagePaths pp ON (p.cID = pp.cID and pp.ppIsCanonical = true) LEFT JOIN PageSearchIndex psi ON p.cID = psi.cID LEFT JOIN PageTypes pt ON p.ptID = pt.ptID INNER JOIN Collections c ON p.cID = c.cID INNER JOIN CollectionVersions cv ON p.cID = cv.cID LEFT JOIN CollectionSearchIndexAttributes csi ON c.cID = csi.cID WHERE (pt.ptID = ?) AND (p.cParentID = ?) AND (p.cPointerID < 1) AND (p.cIsTemplate = 0) AND (cvIsApproved = 1) AND (p.cIsActive = ?) AND (p.cIsSystemPage = ?) GROUP BY navYear, navMonth ORDER BY cvDatePublic desc' with params [7, 159, true, false]: SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'concrete5.cv.cvDatePublic' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by


can anyone help please?

Thanks

Simon