Got following error in the log:

Log type:  OrderError  
Severity:  11  
Message:  Error while placing order. Shipping total couldn't be calculated  
Exception:  System.Exception: NopSolutions.NopCommerce.Common.NopException: Shipping total couldn't be calculated at NopSolutions.NopCommerce.BusinessLogic.Orders.OrderManager.PlaceOrder(PaymentInfo paymentInfo, Customer customer, Guid orderGuid, Int32& orderId) in F:\Temp\Test\nopCommerce 1.60\Libraries\Nop.BusinessLogic\Orders\OrderManager.cs:line 2889  


Can someone help? Thanks!