An error while processing the field: confirmShipmentAction from PX.Objects.SO.SOShipmentEntry

Hi Everyone.

I Developing webhook but while publishing i encounter error 

An error while processing the field: confirmShipmentAction from PX.Objects.SO.SOShipmentEntry

and this my current setup.

  public async Task HandleAsync(WebhookContext context, CancellationToken cancellation)
  {

      #region Connection Setup
      PXDataRecord? record = PXDatabase.SelectSingle<AISCubiicConnectionSetup>(
          new PXDataField<AISCubiicConnectionSetup.userName>(),
          new PXDataField<AISCubiicConnectionSetup.tenantName>()
      );

      string? userName = record.GetString(0);
      string? tenantName = record.GetString(1);

      string fullUsername = string.IsNullOrWhiteSpace(tenantName)
          ? userName
          : $"{userName}@{tenantName}";
      #endregion

      using (new PXLoginScope(fullUsername))
      {
          using (var jr = new JsonTextReader(context.Request.CreateTextReader()))
          {
              var payload = Serializer.Deserialize<ConsignmentsResponse>(jr);

              if (payload == null)
              {
                  context.Response.StatusCode = 400; 
                  return;
              }

              SOShipmentEntry shipmentGraph = PXGraph.CreateInstance<SOShipmentEntry>();
              SOOrderEntry sOOrderEntry = PXGraph.CreateInstance<SOOrderEntry>();

              // Load all carriers once — keyed by Description — to avoid a DB query per consignment
              var carriersByDescription = SelectFrom<Carrier>.View
                  .Select(shipmentGraph)
                  .RowCast<Carrier>()
                  .Where(car => car.Description != null)
                  .ToDictionary(car => car.Description!.Trim(), car => car,
                      StringComparer.OrdinalIgnoreCase);

              foreach (var c in payload)
              {
                  if (string.IsNullOrWhiteSpace(c.ItemReference) ||
                      string.IsNullOrWhiteSpace(c.SenderReferences))
                      continue;

                  shipmentGraph.Document.Current = shipmentGraph
                      .Document.Search<SOShipment.shipmentNbr>(c.SenderReferences);

                  sOOrderEntry.Document.Current = sOOrderEntry
                   .Document.Search<SOOrder.orderNbr>(shipmentGraph.soorder.Current.OrderNbr);

                  if (shipmentGraph.Document.Current == null) continue;

                  shipmentGraph.Packages.Current = shipmentGraph
                      .Packages.Search<SOPackageDetail.shipmentNbr>(c.SenderReferences);

                  SOPackageDetailEx sOPackageDetail = new SOPackageDetailEx();

                  if (shipmentGraph.Document.Current.ShipmentNbr != null)
                  {
                      shipmentGraph.Document.Cache.
                          SetValueExt<SOShipmentExtension.usrAISConsignmentNbr>
                          (shipmentGraph.Document.Current, c.ConsignmentNo);

                      carriersByDescription.TryGetValue(
                              c.CarrierName?.Trim() ?? string.Empty, out Carrier? carrier);

                      if (carrier == null)
                          throw new PXException(
                             		// Acuminator disable once PX1053 ConcatenationPriorLocalization [Justification]
                             		String.Format(Message.CarrierNotFound, c.CarrierName));

                      shipmentGraph.Document.Cache
                          .SetValueExt<SOShipment.shipVia>
                          (shipmentGraph.Document.Current, carrier.CarrierID);

                      shipmentGraph.Document.Cache
                          .SetValueExt<SOShipmentExtension.usrAISTrackingURL>
                          (shipmentGraph.Document.Current, c.TrackingUrl);

                      shipmentGraph.Document.Cache
                         .SetValueExt<SOShipmentExtension.usrAISServiceName>
                         (shipmentGraph.Document.Current, c.ServiceName);

                      sOPackageDetail.Confirmed = true;

                      sOPackageDetail.BoxID = c.ItemUnitOfMeasureName;

                      sOPackageDetail.TrackNumber = c.ConsignmentNo;

                      sOPackageDetail.Description = c.ItemReference;

                      sOPackageDetail.Height = c.ItemHeight;

                      sOPackageDetail.Weight = c.ItemWeight;

                      sOPackageDetail.Width = c.ItemWidth;

                      sOPackageDetail.Length = c.ItemLength;

                      shipmentGraph.Document.Cache.Update(shipmentGraph.Document.Current);
                      shipmentGraph.Packages.Cache.Update(sOPackageDetail);

                  }
              }

              shipmentGraph.Actions.PressSave();

              shipmentGraph.confirmShipmentAction.Press();

          }
      }
  }

Thanks.