FulfillmentService function not working after update to latest version ! about shopifysharp HOT 3 OPEN

Try
    Dim fulfillmentOrderService As New FulfillmentOrderService(domain, accessToken)
    Dim fulfillmentService As New FulfillmentService(domain, accessToken)

    Dim policy As New LeakyBucketExecutionPolicy()

    fulfillmentOrderService.SetExecutionPolicy(policy)
    fulfillmentService.SetExecutionPolicy(policy)

    ' Find open fulfillment orders for this order
    Dim openFulfillmentOrders = Await fulfillmentOrderService.ListAsync(orderId)
    openFulfillmentOrders = openFulfillmentOrders.Where(Function(f) f.Status = "open").ToList()

    ' Fulfill all line items across all open fulfillment orders in this Shopify order
    Dim lineItems = openFulfillmentOrders.Select(Function(o) New LineItemsByFulfillmentOrder With {
        .FulfillmentOrderId = o.Id.Value
        ' Optionally specify a list of line items if you're doing a partial fulfillment
        ' .FulfillmentRequestOrderLineItems = ...
    })

    ' Fulfill the line items
    Dim fulfillment = Await fulfillmentService.CreateAsync(New FulfillmentShipping With {
        .Message = "items are shipping!",
        ' Set to true to send an email to the customer that their items have shipped
        .NotifyCustomer = False,
        ' You can leave the tracking info out if you have no tracking info
        .TrackingInfo = New TrackingInfo With {
            .Company = "UPS",
            .Url = "...",
            .Number = "..."
        }
    })
Catch ex As Exception
    If DoAllStockUpdate = False Then MsgBox("SetOrdersAsComplete-->" & ex.Message)
    Return False
End Try