Error: Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column '' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
SQL: SELECT u.* FROM posts p, users u WHERE u.userid=p.userid GROUP BY p.userid ORDER BY DESC LIMIT 24

Error: There was an error connecting to the database. (Db.class.php)