Not sure this is the right place to post this question:

I am in the process of testing the Shopping cart and using the Authorize Net  Provider

I am using a AuthorizeNet test account and setting the version 3.1.

Once I enter the test card information and click comfirm order  I am receiveing  the following error.

InnerException: Value cannot be null. Parameter name: format
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.String.format
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Value cannot be null. Parameter name: format ---> System.ArgumentNullException: Value cannot be null. Parameter name: format at System.String.format(IformatProvider provider, String format, Object[] args) at System.String.format(String format, Object arg0, Object arg1, Object arg2) at DotNetNuke.Modules.Store.Cart.PaymentControlBase.generateOrderConfirmation() at DotNetNuke.Modules.Store.Cart.PaymentControlBase.invokePaymentSucceeded() at DotNetNuke.Modules.Store.Cart.AuthorizeNetPayment.btnProcess_Click(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String EVENT_ARGUMENT) at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String EVENT_ARGUMENT) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String EVENT_ARGUMENT) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

Thank you for any help