Unable to get google analytics data_mcf data after a valid call, shows data but calling getConversionPathValue() return nothing

Question

This is the data I get from google api explorer:

"rows": [ [ { "conversionPathValue": [ { "interactionType": "CLICK", "nodeValue": "(not set)" } ] }, { "primitiveValue": "6" }, { "primitiveValue": "4.0" }

See Screenshot from google api explorer 1

This is the successful api call using PHP dumping one of the result row

array(425) { [0] => class Google_Service_Analytics_McfDataRows#612 (7) { protected $collection_key => string(19) "conversionPathValue" protected $conversionPathValueType => string(55) "Google_Service_Analytics_McfDataRowsConversionPathValue" protected $conversionPathValueDataType => string(5) "array" public $primitiveValue => NULL protected $internal_gapi_mappings => array(0) { } protected $modelData => array(3) { [0] => array(1) { ... } 1 => array(1) { ... } 2 => array(1) { ... } } protected $processed => array(0) { } }

See Screenshot 2

This is my php script dumping conversionPathValue and primitiveValue but returns null

           $options = array(
               'dimensions' => 'mcf:basicChannelGroupingPath'
           );
           $metrics='mcf:totalConversions,mcf:totalConversionValue';
           $q=$this->analytics_svc->data_mcf->>get('ga:'.$profile,$from,$to,$metrics,$options);
           //echo var_dump($q);
           if($q && isset($q->rows)){
               $d=$q->getRows();
               foreach($d as $v){
                   echo var_dump($v->getConversionPathValue());
                   echo var_dump($v->getPrimitiveValue());
                   break;
               }
               return [];
           }

Calling getConversionPathValue() and getPrimitiveValue() return nothing.