Xaml Designer not loading

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today i've installed Visual Studio Community 2015 with Update 1 and when it try to load the Xaml Designer (even of a new project) it throws an exception:

An unhandled exception has occured

System.Runtime.InteropServices.COMException The app did not start. (Exception from HRESULT: 0x8027025B)

at
Microsoft.VisualStudio.DesignTools.HostUtility.AppPackage.AppPackageNativeMethods.IApplicationActivationManager.ActivateApplication(String appUserModelId, String activationContext, ActivateOptions options, Int32& processId)
at Microsoft.VisualStudio.DesignTools.HostUtility.AppPackage.DesignerWrtUtility.ActivateApplication(String appUserModelId, String activationContext, Object site, Boolean isRunningElevated)
at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.ActivateApplicationInternal(String appUserModelId, String activationContext, Object site)
at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.CreateDesignerProcess(String applicationPath, String clientPort, Uri hostUri, IDictionary environmentVariables, Int32& processId, Object& processData)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.ProcessDomainFactory.ProcessIsolationDomain..ctor(ProcessDomainFactory factory, IIsolationBoundary boundary, AppDomainSetup appDomainInfo, IIsolationTarget isolationTarget, String baseDirectory)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.ProcessDomainFactory.CreateIsolationDomain(IIsolationBoundary boundary)
at Microsoft.VisualStudio.DesignTools.HostUtility.Platform.AppContainerProcessDomainFactory.CreateIsolationDomain(IIsolationBoundary boundary)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.IsolationBoundary.Initialize()
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.Primitives.IsolationBoundary.CreateInstance[T](Type type)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedObjectFactory.Initialize()
at Microsoft.VisualStudio.DesignTools.DesignerHost.Services.VSIsolationService.CreateObjectFactory(IIsolationTarget isolationTarget, IObjectCatalog catalog)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolationService.CreateLease(IIsolationTarget isolationTarget)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolationService.CreateLease(IIsolationTarget isolationTarget)
at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.CreateLease(IIsolationTarget isolationTarget, CancellationToken cancelToken, DesignerServiceEntry& entry, IServiceProvider serviceOverrides)
at Microsoft.VisualStudio.DesignTools.DesignerContract.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken)
at Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedTaskScheduler.InvokeWithCulture[T](CultureInfo culture, Func'2 func, CancellationToken cancelToken)
at
Microsoft.VisualStudio.DesignTools.DesignerContract.Isolation.IsolatedTaskScheduler.<>c__DisplayClass10_0'1.b__0()
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()

xaml-designer
visual-studio-2015
asked on Stack Overflow Dec 4, 2015 by Cristian Cundari • edited Dec 4, 2015 by Cristian Cundari

2 Answers

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I had the same problem, this fixed it:

  • uninstall Visual Studio
  • uninstall all Windows SDKs/Emulators
  • install everything again

After that everything worked fine again.

answered on Stack Overflow Jan 3, 2016 by ehmunnehm
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  • If you're using an HP:

Delete the "Platform" environment variable in Control Panel > System > Advanced System Settings > Environment Variables [...] =HPD. (source)

  • If you're not using an HP, try following these steps:

    1. Close any instance of Visual Studio
    2. Open Visual Studio and create a new C# UWP empty project (name it whatever you want)
    3. Run the newly created "useless" project, then close it as Visual Studio
    4. Re-open your previous project. (source)

  • If you recently upgraded to the Windows 10 SDK from 10240 to 10586, then try setting the project Properties > Application > "Target version" to Windows 10 (10.0; Build 10240). (source)

Let me know if this helps!

answered on Stack Overflow Dec 7, 2015 by Saelia • edited May 23, 2017 by Community

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