SELECT list is not in GROUP BY...sql_mode=only_full_group_by

[support]

After installing Open Real Estate you may encounter the following error:
CDbException: SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1 of SELECT list 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

Try to delete ONLY_FULL_GROUP_BY setting if you have access to mysql console
For example:

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mysql > SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY','')); 

If you don't have access to mysql console:
open file protected\config\db.php and before the line:

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'class' => 'CDbConnection', 

add:

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'initSQLs' => array("SET SESSION sql_mode='TRADITIONAL';")