Exception: Failed to build Visual Studio project using arguments 'C:\Program Files (x86)\MSBuild\14.0\Bin\MSBuild.exe compile error on windows phone 8.1 platform

Hi everybody, I have been working on a game and everything was going okay! up until now I was testing it on android devices and today I tried on windows phone 8.1 and I get this mind killing error that I can’t figure out. I looked the internet and there was no clear answer, here is the description:

Exception: Failed to build Visual Studio project using arguments ‘C:\Program Files (x86)\MSBuild\14.0\Bin\MSBuild.exe “C:\Users\GRGS\Documents\UnityProjects\Falling Monkey\WinBuild\Falling Monkey.sln” /nologo /maxcpucount /p:Configuration=Master /p:Platform=ARM /p:SolutionDir=“C:\Users\GRGS\Documents\UnityProjects\Falling Monkey\WinBuild\” /t:Build /clp:Verbosity=minimal’.
Output: UnityInstallationDir “C:\Program Files\Unity\Editor”.
UnityWSAPlayerDir “C:\Program Files\Unity\Editor\Data\PlaybackEngines\MetroSupport”.
UnityProjectDir “C:\Users\GRGS\Documents\UnityProjects\Falling Monkey”.
Copying unprocessed assemblies…
Running AssemblyConverter…
AssemblyConverter done.
Falling Monkey → C:\Users\GRGS\Documents\UnityProjects\Falling Monkey\WinBuild\Falling Monkey\bin\ARM\Master\Falling Monkey.exe
C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\AppxPackage\Microsoft.AppXPackage.Targets(880,5): error APPX1639: File ‘MakePri.exe’ not found. See Windows SDK and emulator archive | Microsoft Developer for more information. [C:\Users\GRGS\Documents\UnityProjects\Falling Monkey\WinBuild\Falling Monkey\Falling Monkey.csproj]

ApplicationLauncherImpl.RunMSBuild (System.String args) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/ApplicationLauncher.cs:294)
ApplicationLauncherImpl.Build () (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/ApplicationLauncher.cs:179)
ApplicationLauncher.BuildAndRun (BuildLaunchPlayerArgs args, WSASDK wsaSDK) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/ApplicationLauncher.cs:56)
ApplicationLauncher.BuildAndRun (BuildLaunchPlayerArgs args) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/ApplicationLauncher.cs:46)
UnityEditor.Metro.BuildPostprocessor.LaunchPlayer (BuildLaunchPlayerArgs args) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/ExtensionModule.cs:95)
UnityEditor.PostprocessBuildPlayer.Launch (BuildTarget target, System.String path, System.String productName, BuildOptions options) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:282)
UnityEditor.HostView:OnGUI()

Can anyone help me please, thank you in advance.

Same problem here. As usual, Unity just doesn’t seem to care about Windows Phone support–much like Microsoft, apparently.