vs2019 xaml设计器发生了未经处理的异常

知道这是什么原因吗，每次点一下XAML那里都会弹出VS xaml designer已停止工作


System.ArgumentNullException
值不能为 null。
参数名: path1
在 System.IO.Path.Combine(String path1, String path2)
在 Microsoft.VisualStudio.DesignTools.Utility.FolderHelper.get_BlendFolder()
在 Microsoft.VisualStudio.DesignTools.Designer.Themes.FolderBasedThemeManager.GetAvailableSystemThemeFolder(String[] subfolderNames)
在 Microsoft.VisualStudio.DesignTools.WpfDesigner.Themes.WpfThemeManager.get_ThemeFolder()
在 Microsoft.VisualStudio.DesignTools.Designer.Tools.Assets.ThemeContentProvider.GetThemeResourceFromPlatform(IPlatform platform, XamlResourceKey resourceKey, IList`1& auxiliaryResources)
在 Microsoft.VisualStudio.DesignTools.XamlDesigner.Commands.ReplaceStyleTemplateCommand.ResolveDefaultStyle(SceneNode targetElement, Object defaultStyleKey, Boolean allowDefaultStyle, DocumentNode& currentStyle, Boolean& isThemeStyle, IList`1& auxiliaryResources)
在 Microsoft.VisualStudio.DesignTools.XamlDesigner.Commands.ReplaceStyleTemplateCommand.ProvideCurrentStyle(SceneNode targetElement, IType targetType, PropertyReference targetPropertyReference, Boolean allowDefaultStyle, IList`1& auxiliaryResources)
在 Microsoft.VisualStudio.DesignTools.XamlDesigner.Commands.EditCopyOfStyleCommand.get_IsEnabled()
在 Microsoft.VisualStudio.DesignTools.Utility.Commands.Command.GetProperty(String propertyName, Object defaultValue)
在 Microsoft.VisualStudio.DesignTools.XamlDesigner.Commands.ReplaceStyleTemplateCommand.GetProperty(String propertyName)
在 Microsoft.VisualStudio.DesignTools.Utility.Commands.CommandTarget.<>c__DisplayClass21_0.<GetCommandProperty>b__0()
在 Microsoft.VisualStudio.DesignTools.Utility.ProtectionZone.DummyProtectionZone.Execute[T](Func`1 func)
在 Microsoft.VisualStudio.DesignTools.Utility.Commands.CommandTarget.GetCommandProperty(String commandName, String propertyName)
在 Microsoft.VisualStudio.DesignTools.Designer.Views.SceneView.UpdateCommandState(IEnumerable`1 commandNames, Boolean forceRefresh)
在 Microsoft.VisualStudio.DesignTools.Designer.Views.SceneView.SelectionManager_LateActiveSceneUpdatePhase(Object sender, SceneUpdatePhaseEventArgs args)
在 Microsoft.VisualStudio.DesignTools.Designer.ViewModel.SceneUpdatePhaseEventHandler.Invoke(Object sender, SceneUpdatePhaseEventArgs e)
在 Microsoft.VisualStudio.DesignTools.Designer.ViewModel.Selection.SelectionManager.FireLateActiveSceneUpdatePhase(SceneUpdatePhaseEventArgs args)
在 Microsoft.VisualStudio.DesignTools.Designer.Views.SceneViewUpdateScheduleTask.UpdateLate()
在 Microsoft.VisualStudio.DesignTools.Utility.Scheduler.ScheduleTask.Update()
在 Microsoft.VisualStudio.DesignTools.Utility.Scheduler.SchedulingService.DispatchTasksAtPriority(DispatcherPriority priority)
在 Microsoft.VisualStudio.DesignTools.Utility.Scheduler.SchedulingService.DispatcherToken.Dispatch(Object arg)
在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
在 System.Windows.Threading.DispatcherOperation.InvokeImpl()
在 System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
在 MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
在 MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
在 System.Windows.Threading.DispatcherOperation.Invoke()
在 System.Windows.Threading.Dispatcher.ProcessQueue()
在 System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
在 System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
在 MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
在 MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
在 System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
在 System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
在 System.Windows.Application.RunDispatcher(Object ignore)
在 System.Windows.Application.RunInternal(Window window)
在 System.Windows.Application.Run(Window window)
在 Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.DesignerProcess.RunApplication()
在 Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.DesignerProcess.<>c__DisplayClass3_0.<Main>b__0()
在 System.Threading.ThreadHelper.ThreadStart_Context(Object state)
在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
在 System.Threading.ThreadHelper.ThreadStart()