app-store - ErrorCode, Ti.storekit-1.6.0

Question

I develop now using Ti.storekit-1.6.0. (TitaniumStudio SDK-2.1.3GA)

Description below shows the current my code

$btnItem1.addEventListener('click', function(e){
 // 250 
var product = 'net.oratta.info.0250';
var Storekit = require('ti.storekit');
Storekit.purchase(product, function (evt) {
         switch (evt.state) {
              case Storekit.FAILED:
                      alert('ERROR: Buying failed!');
                      break;
               case Storekit.PURCHASED:
               case Storekit.RESTORED:
                      alert('Thanks!');
                      //markProductAsPurchased(product.identifier);
                      break;
          }
     });
 });

---

The information of iTuensConnect has become like below

Apple ID : 567415203 Bundle ID : net.oratta.info

[In-App Purchase Summary] Reference Name: 250 Coin Product ID: net.oratta.info.0250 Type: Consumable

Apple ID: 568619867

But, following kind of error coming out, it does not operate normally

"-[__NSCFString product]: unrecognized selector sent to instance 0x1d4f7c20"

When how it does, this error can be evaded? I request your advice.

Thanks,