Omeka has encountered an error

Zend_Db_Statement_Mysqli_Exception

Mysqli prepare error: Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'omeka.item_order_item_orders.order' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

Zend_Db_Statement_Mysqli_Exception: Mysqli prepare error: Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'omeka.item_order_item_orders.order' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by in /var/www/application/libraries/Zend/Db/Statement/Mysqli.php:77
Stack trace:
#0 /var/www/application/libraries/Zend/Db/Statement.php(115): Zend_Db_Statement_Mysqli->_prepare('SELECT `items`....')
#1 /var/www/application/libraries/Zend/Db/Adapter/Mysqli.php(388): Zend_Db_Statement->__construct(Object(Zend_Db_Adapter_Mysqli), 'SELECT `items`....')
#2 /var/www/application/libraries/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Adapter_Mysqli->prepare('SELECT `items`....')
#3 /var/www/application/libraries/Omeka/Db.php(79): Zend_Db_Adapter_Abstract->query('SELECT `items`....', Array)
#4 /var/www/application/libraries/Omeka/Db/Table.php(648): Omeka_Db->__call('query', Array)
#5 /var/www/application/libraries/Omeka/Db/Table.php(281): Omeka_Db_Table->fetchObjects(Object(Omeka_Db_Select))
#6 /var/www/application/controllers/CollectionsController.php(47): Omeka_Db_Table->findBy(Array, 200)
#7 /var/www/application/libraries/Zend/Controller/Action.php(516): CollectionsController->showAction()
#8 /var/www/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('showAction')
#9 /var/www/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#10 /var/www/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#11 /var/www/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#12 /var/www/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#13 /var/www/index.php(23): Omeka_Application->run()
#14 {main}