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Issue building UWP apps: Error WMC1006: Cannot resolve Assembly or Windows Metadata file

A customer contacted me because they had errors building an UWP application on one of their build servers. Here are the related build logs:

MarkupCompilePass1:

  Creating directory "obj\x86\Release\intermediatexaml\".

App1\App1.csproj(0,0): Error WMC1006: Cannot resolve Assembly or Windows Metadata file 'Type universe cannot resolve assembly: System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.'

D:\Builds\dev-agent-1\_work\76\s\App1\App1.csproj : XamlCompiler error WMC1006: Cannot resolve Assembly or Windows Metadata file 'Type universe cannot resolve assembly: System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.'

  (Out) GeneratedCodeFiles: 'D:\Builds\dev-agent-1\_work\76\s\App1\obj\x86\Release\App.g.i.cs;D:\Builds\dev-agent-1\_work\76\s\App1\obj\x86\Release\App.g.cs'

  (Out) Compile: 'App.xaml.cs;MainPage.xaml.cs;Properties\AssemblyInfo.cs;D:\Builds\dev-agent-1\_work\76\s\App1\obj\x86\Release\App.g.i.cs;D:\Builds\dev-agent-1\_work\76\s\App1\obj\x86\Release\App.g.cs'

XamlPreCompile:

  D:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\Roslyn\csc.exe /noconfig /nowarn:2008,1701,1702 /nostdlib+ /platform:x86 /errorreport:prompt /warn:0 /define:TRACE;NETFX_CORE;WINDOWS_UWP;CODE_ANALYSIS /highentropyva+ /reference:"C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.Calls.CallsVoipContract\2.0.0.0\Windows.ApplicationModel.Calls.CallsVoipContract.winmd" /reference:"C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.SocialInfo.SocialInfoContract\2.0.0.0\Windows.ApplicationModel.SocialInfo.SocialInfoContract.winmd" /reference:"C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.ApplicationModel.StartupTaskContract\2.0.0.0\Windows.ApplicationModel.StartupTaskContract.winmd" /reference:"C:\Program Files (x86)\Windows Kits\10\References\10.0.16299.0\Windows.Devices.Custom.CustomDeviceContract\1.0.0.0\Windows.Devices.Custom.CustomDeviceContract.winmd" /reference:"C:\Program Files...

  Using shared compilation with compiler from directory: D:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin\Roslyn

CSC(0,0): Error CS2001: Source file 'D:\Builds\dev-agent-1\_work\76\s\App1\obj\x86\Release\App.g.i.cs' could not be found.

CSC : error CS2001: Source file 'D:\Builds\dev-agent-1\_work\76\s\App1\obj\x86\Release\App.g.i.cs' could not be found. [D:\Builds\dev-agent-1\_work\76\s\App1\App1.csproj]

Done Building Project "D:\Builds\dev-agent-1\_work\76\s\App1\App1.csproj" (default targets) -- FAILED.

Done Building Project "D:\Builds\dev-agent-1\_work\76\s\App1.sln" (default targets) -- FAILED.

Build FAILED.

On our local systems everything worked fine and even on our Hosted Build Server on VSTS, we were able to build without any issues. We were quite confident the problem was related to the targeted UWP version as with older UWP apps we didn’t had any issues.

After contacting Microsoft they told us to switch our build server from Windows Server 2012R2 to 2016. After upgrading everything started to work!

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