I'm getting the following error and haven't made any changes to allowDisplay variable and don't know how to figure out what the error is. There is a customization to hide the Checkout button on the notifier popup under certain conditions. Do I need to do something with allowDisplay? Thanks, these parameters are all new for me. Here's the code that hides it-allowCheckout is a boolean I populated in code at top of page:
@if (ViewBag.CheckoutButtonVisible == true && allowCheckout)
{
<button type="submit" class="btn btn-primary" onclick="document.getElementById('IsMiniDropdownCheckoutButton').value = '1'">@GetResourceString("retail.minibasketdropdown.checkout")</button>
}



An error has occured at https://www.xxx.com/Checkout/_ItemAddedNotify View less
Exception: The parameters dictionary contains a null entry for parameter 'allowDisplay' of non-nullable type 'System.Boolean' for method 'System.Web.Mvc.ActionResult _ItemAddedNotify(Boolean)' in 'AbleCommerce.Controllers.CheckoutController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.Parameter name: parameters Stack Trace: at System.Web.Mvc.ActionDescriptor.ExtractParameterFromDictionary(ParameterInfo parameterInfo, IDictionary`2 parameters, MethodInfo methodInfo) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.b__12() at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at System.Web.Mvc.Controller.ExecuteCore() at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) at System.Web.Mvc.Async.AsyncResultWrapper.<.cctor>b__0(IAsyncResult asyncResult, Action action) at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.b__5(IAsyncResult asyncResult, ProcessRequestState innerState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)