Error: Exception has been thrown by the target of an invocation.

Source: System.Private.CoreLib

Stack Trace: 
   at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.PropertyInfo.GetValue(Object obj)
   at Amdocs.Ginger.Repository.NewRepositorySerializer.WriteRepoItemAttrs(XmlTextWriter xml, RepositoryItemBase ri) in D:\a\Ginger\Ginger\Ginger\GingerCoreCommon\Repository\NewRepositorySerializer.cs:line 208
   at Amdocs.Ginger.Repository.NewRepositorySerializer.xmlwriteObject(XmlTextWriter xml, RepositoryItemBase ri) in D:\a\Ginger\Ginger\Ginger\GingerCoreCommon\Repository\NewRepositorySerializer.cs:line 169
   at Amdocs.Ginger.Repository.NewRepositorySerializer.SerializeToString(RepositoryItemBase ri) in D:\a\Ginger\Ginger\Ginger\GingerCoreCommon\Repository\NewRepositorySerializer.cs:line 109
   at Amdocs.Ginger.Repository.RepositoryItemBase.ReplaceOldGuidUsages(List`1 list) in D:\a\Ginger\Ginger\Ginger\GingerCoreCommon\Repository\RepositoryItemBase.cs:line 866
   at Amdocs.Ginger.Repository.RepositoryItemBase.CreateCopy(Boolean setNewGUID, Boolean deepCopy) in D:\a\Ginger\Ginger\Ginger\GingerCoreCommon\Repository\RepositoryItemBase.cs:line 844
   at Ginger.Variables.AddVariablePage.AddLibraryVariables() in D:\a\Ginger\Ginger\Ginger\Ginger\Variables\AddVariablePage.xaml.cs:line 147
   at Ginger.Variables.AddVariablePage.AddVariableButton_Click(Object sender, RoutedEventArgs e) in D:\a\Ginger\Ginger\Ginger\Ginger\Variables\AddVariablePage.xaml.cs:line 133
   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 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.HwndWrapper.WndProc(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)