Error in Order Agent Constructor

I am trying to use the following Order Agent API code to create the OrderManagementContext object

OrderServiceAgent orderService = new OrderServiceAgent(@"http://localhost:8080/CatalogWebService/CatalogWebService.asmx");
orderService.Credentials = System.Net.CredentialCache.DefaultCredentials;

OrderManagementContext orderManagemntCtxt = OrderManagementContext.Create(orderService);

However, I am getting the following exception during the last line (creating orderManagemntCtxt );

Value cannot be null. Parameter name: format

at System.String.Format(IFormatProvider provider, String format, Object[] args) at Microsoft.CommerceServer.Orders.OrderManagementContext..ctor(OrderServiceAgent agent)

at Microsoft.CommerceServer.Orders.OrderManagementContext.Create(OrderServiceAgent agent) at CS2007WebParts.ProductCatalogDisplay.Render(HtmlTextWriter writer)

in C:\Commerce Server\Commerce Server SharePoint Integration Files\CS2007WebParts\CS2007WebParts\ProductCatalogDisplay.cs:line 72

I have confirmed that the web service URL is working fine.

I would really appreciate any help on this one.

[1374 byte] By [UmeshBhatt] at [2008-1-7]