Error: Data structure returned is not convertible in the requested format. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized. The data structure looks like this: $data = array ( 0 => array ( 'idcustomdimension' => '1', 'idsite' => '1', 'name' => 'a', 'index' => '1', 'scope' => 'visit', 'active' => false, 'extractions' => array ( ), 'case_sensitive' => true, ), );