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Home/ Questions/Q 9017281
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Editorial Team
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Editorial Team
Asked: June 16, 20262026-06-16T04:13:50+00:00 2026-06-16T04:13:50+00:00

I have installed the Windows Phone SDK 8.0 and Visual Studio 2012 Premium with

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I have installed the Windows Phone SDK 8.0 and Visual Studio 2012 Premium with Update 1. When I create now a new phone project I get three errors:

Error 1 The “CompileXaml” task could not be instantiated from
“C:\Program Files
(x86)\MSBuild\Microsoft\WindowsPhone\v8.0\Microsoft.Silverlight.WindowsPhone.Build.Tasks.dll”.
Could not load file or assembly ‘Microsoft.Build.dll’ or one of its
dependencies. An attempt was made to load a program with an incorrect
format.

Error 2 The “CompileXaml” task has been declared or used incorrectly,
or failed during construction. Check the spelling of the task name and
the assembly name.

Error 3 The name “LocalizedStrings” does not exist in the namespace
“clr-namespace:PhoneApp24”. C:\PhoneDevelopment\PhoneApp24\PhoneApp24\App.xaml

While googling I found some guys out there who have similar errors while using Windows 8 in a virtual machine. But in my case I have installed everything on my laptop. I have also already uninstalled VS2012 and the SDK. But after the reinstallation I still get the same exceptions.

Can someone please give me some hints?

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  1. Editorial Team
    Editorial Team
    2026-06-16T04:13:52+00:00Added an answer on June 16, 2026 at 4:13 am

    After spending hours trying to get the sdk working I finally did a window recovery. Since windows 8 this is now a very quick process. Just insert the windows cd and run the setup again. If you choose the right option you can reinstall windows 8 without loosing your data. After 10 minutes your system reboots and you have to fill in again some data.

    After that I installed the SDK. No error poped out and everything went very smoothly. Then I started VS express, created a project and built it successfully!

    After the SDK installation I found two additional tiles on my desktop: “Hyper-V Manager” and “Hyper-V Virtual Machine…”. I am pretty sure that those two tiles were not when I installed the SDK before. So I guess that I have had some problems with my virtual machine and that this was probably the source of the building exceptions.

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