C# Visual Studio 2015 Update 1中WPF项目设计器中的SystemNullReferenceException

在更新1之前，它工作正常。我的设置或更新1有什么问题

其他信息：

• 我有一台HP机器，但没有任何环境变量：“平台”。（我这样说是因为这个）
• 我尝试将解决方案的每个项目设置为“x86”编译，也尝试将设置为“任意CPU”
• 它只发生在一个对话框上，其他所有对话框和用户控件都可以
• “坏图像格式”通常发生在混合不同处理器的代码时。例如：为x86编译的dll和为x64编译的另一个dll
• 该项目编译并运行良好。该缺陷仅在设计模式下发生

关于我的三个选择：

如果我选择“单击此处禁用…”，我将收到以下信息：

如果我选择“单击此处重新加载…”，我将获得一个新的堆栈跟踪（在x86或任何CPU中，现在总是该异常）：

异常堆栈跟踪：

System.NullReferenceException
Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.DesignTools.Platform.Utility.DocumentContext.CreateNode(ITypeId typeId)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseRootElement(XamlParserContext parserContext, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.Parse(XamlParserContext parserContext, XmlDocumentReference xmlDocumentReference, XmlDocument xmlDocument)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseInternal(XamlParserContext parserContext)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlLanguageService.ParseDocument(CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Markup.MarkupDocument..ctor(IDocumentContext documentContext, ITypeId expectedRootType, ITextBuffer textBuffer, Encoding documentEncoding, IMarkupLanguageService languageService, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Designer.Documents.SceneMarkupDocument..ctor(IDocumentContext documentContext, IUndoService undoService, ITypeId expectedRootType, ITextBuffer textBuffer, Encoding documentEncoding, IMarkupLanguageService languageService, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Designer.DocumentViewContext.CreateMarkupDocument(ISourceItemContext sourceItem, IHostTextBuffer textBuffer, Encoding encoding, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Designer.DocumentViewContext.CreateDocument(ISourceItemContext sourceItem, CancellationToken cancelToken, Boolean isReadOnly, Boolean cloneBufferToStandalone, Boolean suppressUI, SceneDocument originalSceneDocument)
   at Microsoft.VisualStudio.DesignTools.Designer.DocumentViewContext.OpenDocument(ISourceItemContext sourceItem, CancellationToken cancelToken, Boolean isReadOnly, Boolean suppressUI)
   at Microsoft.VisualStudio.DesignTools.Designer.DesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass12_0.<Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.IRemoteDesignerService.CreateDesigner>b__0(CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass6_0`1.<MarshalInWithCancellation>b__0()
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()

System.NullReferenceException
Object reference not set to an instance of an object.

Server stack trace: 
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalInSynchronous(Action action, Int32 targetApartmentId, CancellationToken cancelToken, CallModality callModality, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalIn(Action action, Int32 targetApartmentId, CancellationToken cancelToken, CallSynchronizationMode syncMode, CallModality callModality, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.MarshalIn(IRemoteObject targetObject, Action action, CancellationToken cancelToken, CallSynchronizationMode syncMode, CallModality callModality, ApartmentState apartmentState, String memberName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.MarshalInWithCancellation[TResult](IRemoteCancellationToken remoteToken, Func`2 func, ApartmentState apartmentState)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostProject remoteProject, IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken remoteToken)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostProject remoteProject, IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.CreateDesignerImpl(IRemoteDesignerService ds, IHostSourceItem item, IHostTextEditor editor, RemoteCancellationToken remoteCancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass14_0.<Microsoft.VisualStudio.DesignTools.DesignerContract.IDesignerService.CreateDesigner>b__0(IRemoteDesignerService ds, RemoteCancellationToken remoteToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass5_0`1.<MarshalOutWithCancellation>b__0(IRemoteDesignerService ds)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass28_0`1.<MarshalOut>b__0()
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()

System.NullReferenceException
Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalOutSynchronous(Action action, Int32 targetApartmentId, WaitHandle aborted, WaitHandle timeoutSignal, CancellationToken cancelToken, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalOut(Action action, Int32 targetApartmentId, WaitHandle aborted, CancellationToken cancelToken, CallSynchronizationMode syncMode, WaitHandle timeoutSignal, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.MarshalOut[TValue](RemoteHandle`1 targetObject, Action action, CancellationToken cancelToken, CallSynchronizationMode syncMode, ApartmentState apartmentState, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.MarshalOut[TValue](RemoteHandle`1 targetObject, Action`1 action, CancellationToken cancelToken, CallSynchronizationMode syncMode, ApartmentState apartmentState, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.MarshalOutWithCancellation[TResult](CancellationToken cancelToken, Func`3 func, ApartmentState apartmentState)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.Microsoft.VisualStudio.DesignTools.DesignerContract.IDesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken)

System.NullReferenceException
对象引用未设置为对象的实例。
位于Microsoft.VisualStudio.DesignTools.Platform.Utility.DocumentContext.CreateNode（ITypeId-typeId）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement（XamlParserContext parserContext，IDocumentNodeReference nodeReference，IType typeId，XmlElementReference XmlElementReference，XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent（XamlParserContext parserContext，IDocumentNodeReference nodeReference，IType typeId，XmlElementReference XmlElementReference，XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement（XamlParserContext parserContext，IDocumentNodeReference nodeReference，XmlElementReference XmlElementReference，XmlElement XmlElement，DocumentNode&node）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent（XamlParserContext parserContext、IDocumentNodeReference nodeReference、XmlElementReference XmlElementReference、XmlElement XmlElement、IProperty childProperty、TypeConverter textTypeConverter、ITypeId textType、PropertyHandling PropertyHandling）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren（XamlParserContext parserContext，DocumentCompositeNodeReference，XmlElementReference，XmlElementXmlElement，XmlElement，谓词'1 propertyFilter）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren（XamlParserContext parserContext、DocumentCompositeNodeReference、XmlElementReference、XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement（XamlParserContext parserContext，IDocumentNodeReference nodeReference，IType typeId，XmlElementReference XmlElementReference，XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent（XamlParserContext parserContext，IDocumentNodeReference nodeReference，IType typeId，XmlElementReference XmlElementReference，XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement（XamlParserContext parserContext，IDocumentNodeReference nodeReference，XmlElementReference XmlElementReference，XmlElement XmlElement，DocumentNode&node）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent（XamlParserContext parserContext、IDocumentNodeReference nodeReference、XmlElementReference XmlElementReference、XmlElement XmlElement、IProperty childProperty、TypeConverter textTypeConverter、ITypeId textType、PropertyHandling PropertyHandling）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren（XamlParserContext parserContext，DocumentCompositeNodeReference，XmlElementReference，XmlElementXmlElement，XmlElement，谓词'1 propertyFilter）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren（XamlParserContext parserContext、DocumentCompositeNodeReference、XmlElementReference、XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement（XamlParserContext parserContext，IDocumentNodeReference nodeReference，IType typeId，XmlElementReference XmlElementReference，XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent（XamlParserContext parserContext，IDocumentNodeReference nodeReference，IType typeId，XmlElementReference XmlElementReference，XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement（XamlParserContext parserContext，IDocumentNodeReference nodeReference，XmlElementReference XmlElementReference，XmlElement XmlElement，DocumentNode&node）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent（XamlParserContext parserContext、IDocumentNodeReference nodeReference、XmlElementReference XmlElementReference、XmlElement XmlElement、IProperty childProperty、TypeConverter textTypeConverter、ITypeId textType、PropertyHandling PropertyHandling）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren（XamlParserContext parserContext，DocumentCompositeNodeReference，XmlElementReference，XmlElementXmlElement，XmlElement，谓词'1 propertyFilter）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren（XamlParserContext parserContext、DocumentCompositeNodeReference、XmlElementReference、XmlElement XmlElement）
位于Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement（XamlParserContext parserContext，IDocumentNodeReference nodeReference，IType typeId，XmlElementReference XmlElementReference，XmlElement XmlElement）
在Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent（XamlParserContext parserContext，
System.NullReferenceException
Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.DesignTools.Platform.Utility.DocumentContext.CreateNode(ITypeId typeId)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, DocumentNode& node)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, IProperty childProperty, TypeConverter textTypeConverter, ITypeId textType, PropertyHandling propertyHandling)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement, Predicate`1 propertyFilter)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.AddPropertiesAndChildren(XamlParserContext parserContext, DocumentCompositeNodeReference nodeReference, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseCompositeElement(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseElementContent(XamlParserContext parserContext, IDocumentNodeReference nodeReference, IType typeId, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseRootElement(XamlParserContext parserContext, XmlElementReference xmlElementReference, XmlElement xmlElement)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.Parse(XamlParserContext parserContext, XmlDocumentReference xmlDocumentReference, XmlDocument xmlDocument)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlParser.ParseInternal(XamlParserContext parserContext)
   at Microsoft.VisualStudio.DesignTools.Markup.XamlLanguageService.ParseDocument(CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Markup.MarkupDocument..ctor(IDocumentContext documentContext, ITypeId expectedRootType, ITextBuffer textBuffer, Encoding documentEncoding, IMarkupLanguageService languageService, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Designer.Documents.SceneMarkupDocument..ctor(IDocumentContext documentContext, IUndoService undoService, ITypeId expectedRootType, ITextBuffer textBuffer, Encoding documentEncoding, IMarkupLanguageService languageService, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Designer.DocumentViewContext.CreateMarkupDocument(ISourceItemContext sourceItem, IHostTextBuffer textBuffer, Encoding encoding, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.Designer.DocumentViewContext.CreateDocument(ISourceItemContext sourceItem, CancellationToken cancelToken, Boolean isReadOnly, Boolean cloneBufferToStandalone, Boolean suppressUI, SceneDocument originalSceneDocument)
   at Microsoft.VisualStudio.DesignTools.Designer.DocumentViewContext.OpenDocument(ISourceItemContext sourceItem, CancellationToken cancelToken, Boolean isReadOnly, Boolean suppressUI)
   at Microsoft.VisualStudio.DesignTools.Designer.DesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass12_0.<Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.IRemoteDesignerService.CreateDesigner>b__0(CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass6_0`1.<MarshalInWithCancellation>b__0()
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()

System.NullReferenceException
Object reference not set to an instance of an object.

Server stack trace: 
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalInSynchronous(Action action, Int32 targetApartmentId, CancellationToken cancelToken, CallModality callModality, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalIn(Action action, Int32 targetApartmentId, CancellationToken cancelToken, CallSynchronizationMode syncMode, CallModality callModality, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.MarshalIn(IRemoteObject targetObject, Action action, CancellationToken cancelToken, CallSynchronizationMode syncMode, CallModality callModality, ApartmentState apartmentState, String memberName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.MarshalInWithCancellation[TResult](IRemoteCancellationToken remoteToken, Func`2 func, ApartmentState apartmentState)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.RemoteDesignerService.Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostProject remoteProject, IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken remoteToken)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostProject remoteProject, IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.CreateDesignerImpl(IRemoteDesignerService ds, IHostSourceItem item, IHostTextEditor editor, RemoteCancellationToken remoteCancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass14_0.<Microsoft.VisualStudio.DesignTools.DesignerContract.IDesignerService.CreateDesigner>b__0(IRemoteDesignerService ds, RemoteCancellationToken remoteToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass5_0`1.<MarshalOutWithCancellation>b__0(IRemoteDesignerService ds)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass28_0`1.<MarshalOut>b__0()
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()

System.NullReferenceException
Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalOutSynchronous(Action action, Int32 targetApartmentId, WaitHandle aborted, WaitHandle timeoutSignal, CancellationToken cancelToken, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.STAMarshaler.MarshalOut(Action action, Int32 targetApartmentId, WaitHandle aborted, CancellationToken cancelToken, CallSynchronizationMode syncMode, WaitHandle timeoutSignal, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.MarshalOut[TValue](RemoteHandle`1 targetObject, Action action, CancellationToken cancelToken, CallSynchronizationMode syncMode, ApartmentState apartmentState, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.ThreadMarshaler.MarshalOut[TValue](RemoteHandle`1 targetObject, Action`1 action, CancellationToken cancelToken, CallSynchronizationMode syncMode, ApartmentState apartmentState, String methodName, String filePath, Int32 lineNumber)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.MarshalOutWithCancellation[TResult](CancellationToken cancelToken, Func`3 func, ApartmentState apartmentState)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Remoting.LocalDesignerService.Microsoft.VisualStudio.DesignTools.DesignerContract.IDesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken)
   at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken)