In App purchase is creating error

I am creating an app which need to add In app Purchasing option to purchase selected video, and when purchased send request to download it on other server with Receipt; I am trying to achieve list of available option to purchase with the fallowing code--

try
{
    ListingInformation ProdList = await CurrentApp.LoadListingInformationAsync();
    lbProductsList.Items.Clear();
    string t = "";

    foreach (var item in ProdList.ProductListings)
    {
        t = string.Format("{0}, {1}, {2},{3}, {4}",
                            item.Key,
                            item.Value.Name,
                            item.Value.FormattedPrice,
                            item.Value.ProductType,
                            item.Value.Description);

        lbProductsList.Items.Insert(0, t);
    }
}
catch (Exception ex)
{
    MessageBox.Show("Error: " + ex.Message);

}

code line- ListingInformation ProdList = await CurrentApp.LoadListingInformationAsync(); its creating problem and control goes to catch block showing error message --

The explicit transaction has been forcibly cancelled. (Exception from HRESULT: 0x8032000F)

and when using registered Product Id it show the fallowing error--

System.Exception: Exception from HRESULT: 0x805A0194

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at IAP.MainPage.d__1.MoveNext()

Would any one please tell what is the problem with it. I am using registed App Id to load information but can't

any help is good for me. Thanks.

can you check your app guid in the WMAppManifest.xml file with guid in DevCenter published app guid? If not, make sure you should update your WMAppManifest.xml with guid from devcenter.