我正在 Visual Studio 2012 中创建一个新的全景应用程序，我在 Designer 中看到以下提到的错误：
以下是错误的详细信息。细节 ：
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System.NullReferenceException 对象引用未设置为对象的实例。在 Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion（NestedCallContext nestedCallContext，BlockingCall 调用，WaitHandle timeoutSignal）在 Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOutSynchronous（操作动作，Int32 targetApartmentId，WaitHandle 中止，WaitHandle timeoutSignal ) 在 Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOut(Action action, Int32 targetApartmentId, WaitHandle aborted, CallSynchronizationMode syncMode, WaitHandle timeoutSignal) 在 Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut[TValue](RemoteHandle 1 targetObject, Action action, CallSynchronizationMode syncMode)
at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut[TResult,TValue](RemoteHandle1 个目标对象，函数2 func, CallSynchronizationMode syncMode)
at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CreateDesignerImpl(IHostSourceItem item, IHostTextEditor editor, RemoteCancellationToken remoteCancelToken)
at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass12.<Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner>b__11(RemoteCancellationToken remoteToken)
at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CallWithCancellation[TResult](CancellationToken cancelToken, Func2 功能）在 Microsoft.Expression.DesignHost.IsolatedDesignerService.IsolatedDesignerView.LocalDesignerService.Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner（IHostSourceItem 项，IHostTextEditor 编辑器，CancellationToken cancelToken）在 Microsoft.Expression.DesignHost.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo（CancellationToken cancelToken ) System.NullReferenceException 对象引用未设置为对象的实例。服务器堆栈跟踪：位于 Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalIn(Action action, Int32 targetApartmentId) 处的 Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal) Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler。1 func)
at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(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.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken cancelToken)
at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass8.<CreateDesignerImpl>b__6(IRemoteDesignerService d)
at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass42.b__3() 在 Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker() System.NullReferenceException 对象引用未设置为对象的实例。在 Microsoft.Expression.Platform.PlatformService.PlatformEntry.get_PlatformCreator() 在 Microsoft.Expression.Platform.PlatformService.IsCompatibleFramework(FrameworkName hostFramework, FrameworkName guestFramework) 在 Microsoft.Expression. Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetSourceItemContext(IHostSourceItem sourceItem) 的 Microsoft.Expression.DesignSurface.DesignerService.CreateDesigner(IHostSourceItem 项) 中的 DesignSurface.Project.ProjectContextManager.GetProjectContext(IHostProject 项目，IPlatform 平台，布尔创建)2 func)
at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass10.<Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner>b__e()
at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass161.b__15() 在 Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()
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更多细节 ：
我在基于 C# 的 windows Phone（全景、数据绑定应用程序、HTML5 等）中创建的每种类型的项目中都存在错误
我尝试过的：
如果您正在提出包括重新安装的解决方案，请不要打扰。我已经尝试过太多次了。
更多信息
我新安装了带有 blend 的 Visual Studio 2012。在安装时，我取消选中 Blend。然后创建了一个新的 Windows Phone 项目。下载 SDK 4 小时（网速慢.. 不相关），然后我在完成后重新启动计算机。然后我为 windows phone 创建了一个新项目。并得到同样的错误。如果我缺少任何东西，请指导我。