Create-DataSet-exception-after-upgrade-to-B129

I just upgraded to Build 129 and every attempt to create a new data set causes this error:
System.Windows.Markup.XamlParseException: Initialization of 'WealthLab.WPF.DataProviderListBox' threw an exception.
---> System.TypeLoadException: Could not load type 'WealthLab.Core.Out' from assembly 'WealthLab.Core, Version=8.0.1.0, Culture=neutral, PublicKeyToken=null'.
at WealthLab.Tradier.TradierSessionManager.LoadSessions()
at WealthLab.Tradier.TradierSessionManager..ctor()
at WealthLab.Tradier.TradierConnection..ctor()
at WealthLab.Tradier.TradierConnection.get_Instance()
at WealthLab.Tradier.TradierHistorical.get_IsConfigured()
at WealthLab.WPF.DataProviderListItem.CallCreator()
at WealthLab.WPF.ThreadUtils.ThreadSafe(Action a)
at WealthLab.WPF.DataProviderListItem.ShowConfigWarning()
at WealthLab.WPF.DataProviderListItem..ctor(ProviderBase prov, Boolean useCheckBox)
at WealthLab.WPF.DataProviderListBox.ComputeCreator()
at WealthLab.WPF.DataProviderListBox.EndInit()
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.InitializationGuard(XamlType xamlType, Object obj, Boolean begin)
--- End of inner exception stack trace ---
at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
at WealthLab8.NewDataSetWindow.InitializeComponent()
at WealthLab8.NewDataSetWindow..ctor()
at WealthLab8.pnlNavDataSets.CustomizeConfiguration(Object last, RoutedEventArgs result)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.Controls.Primitives.ButtonBase.OnClick()
at System.Windows.Controls.Button.OnClick()
at WealthLab.WPF.WLButton.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)