【Unity】アプリ内課金の初期化がエラーになる

Question

iOSの課金テストを行っているんですが下記のようなエラーになります。
製品IDはmodelで登録したので間違っていません。

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Purchasing;x


public class Purchase : MonoBehaviour, IStoreListener
{
    // 購入実行に使用
    private static IStoreController m_StoreController;
    // リストア処理など拡張機能で使用
    private static IExtensionProvider m_StoreExtensionProvider;

    // 消費型アイテムのID
    public static string kProductIDConsumable = "life_max";

    // 非消費型アイテムのID   
    public static string kProductIDNonConsumable = "model";

    // ios AppのBundleId
    private static string kProductNameAppleSubscription = "com.test.Game";

    // Android AppのBundleId
    private static string kProductNameGooglePlaySubscription = "com.test.Game";

    void Start()
    {
        if (m_StoreController == null)
        {
            InitializePurchasing();
        }
    }

    public void InitializePurchasing()
    {
        if (IsInitialized())
        {
            return;
        }

        // builderを作成しプロダクトを登録する。
        var builder = ConfigurationBuilder.Instance(StandardPurchasingModule.Instance());

#if UNITY_ANDROID
		builder.Configure<IGooglePlayConfiguration>().SetPublicKey("公開鍵");
		kProductIDNonConsumable = "model";
#endif
        // プロダクト(アイテム)の登録
        //builder.AddProduct(kProductIDConsumable, ProductType.Consumable);

        builder.AddProduct(kProductIDNonConsumable, ProductType.NonConsumable);
        //builder.AddProduct(kProductIDNonConsumable, ProductType.NonConsumable, new IDs {
        //    //{ "jp.hogehoge.android.1yen", GooglePlay.Name },
        //    { kProductIDNonConsumable, AppleAppStore.Name }
        //});

        // IAP初期化
        UnityPurchasing.Initialize(this, builder);
    }


    private bool IsInitialized()
    {
        return m_StoreController != null && m_StoreExtensionProvider != null;
    }


    public void BuyConsumable()
    {
        BuyProductID(kProductIDConsumable);
    }

    // アプリ内での購入ボタンを押したときなどの処理（非消費型）
    public void BuyNonConsumable()
    {
        BuyProductID(kProductIDNonConsumable);
    }



    void BuyProductID(string productId)
    {
        if (IsInitialized())
        {
            Product product = m_StoreController.products.WithID(productId);

            if (product != null && product.availableToPurchase)
            {
                // 登録したプロダクト（アイテム）で購入をかける
                Debug.Log(string.Format("Purchasing product asychronously: '{0}'", product.definition.id));
                m_StoreController.InitiatePurchase(product);
            }
            else
            {
                Debug.Log("BuyProductID: FAIL. Not purchasing product, either is not found or is not available for purchase");
            }
        }
        // Otherwise ...
        else
        {

            Debug.Log("BuyProductID FAIL. Not initialized.");
        }
    }


    public void RestorePurchases()
    {
        if (!IsInitialized())
        {
            return;
        }

        if (Application.platform == RuntimePlatform.IPhonePlayer ||
            Application.platform == RuntimePlatform.OSXPlayer)
        {

            var apple = m_StoreExtensionProvider.GetExtension<IAppleExtensions>();
            apple.RestoreTransactions((result) =>
            {


                Debug.Log("RestorePurchases continuing: " + result + ". If no further messages, no purchases available to restore.");
            });
        }
        // Otherwise ...
        else
        {
            Debug.Log("RestorePurchases FAIL. Not supported on this platform. Current = " + Application.platform);
        }
    }

    // 初期化成功イベント
    public void OnInitialized(IStoreController controller, IExtensionProvider extensions)
    {
        // 成功すると購入やリストアに使用するインターフェースが返ってくるので保持
        Debug.Log("OnInitialized: PASS");
        m_StoreController = controller;
        m_StoreExtensionProvider = extensions;
    }

    // 初期化、接続処理失敗の時(ネットーワーク不良等)
    public void OnInitializeFailed(InitializationFailureReason error)
    {
        Debug.Log("OnInitializeFailed InitializationFailureReason:" + error);
    }

    // 決済成功時
    public PurchaseProcessingResult ProcessPurchase(PurchaseEventArgs args)
    {
        Debug.Log(args.purchasedProduct.receipt);
        if (String.Equals(args.purchasedProduct.definition.id, kProductIDNonConsumable, StringComparison.Ordinal))
        {
            // UnityIAP上のID
            Debug.Log(string.Format("ProcessPurchase: PASS. Product: '{0}'", args.purchasedProduct.definition.id));
        }
        else
        {
            Debug.Log("PurchaseProcessingResult Else");
        }
        return PurchaseProcessingResult.Pending;
    }

    // 決済失敗時
    public void OnPurchaseFailed(Product product, PurchaseFailureReason failureReason)
    {
        Debug.Log(string.Format("OnPurchaseFailed: FAIL. Product: '{0}', PurchaseFailureReason: {1}", product.definition.storeSpecificId, failureReason));
    }
}