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Xamarin.Forms: Error CS1703 Multiple assemblies with equivalent identity have been imported

When trying to build our Xamarin.Forms project on a VSTS hosted build server, our build failed first with the following error message:

Error CS1703 Multiple assemblies with equivalent identity have been imported: ‘C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0\mscorlib.dll’ and ‘C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll’. Remove one of the duplicate references.

On our local system it worked without any compiler errors. We tried the easiest solution first, following the advice as mentioned in the error message. We removed the mscorlib.dll from the references. After doing that, everything was working again.

I hate it when the behavior differs between a local Visual Studio Build and the build server Sad smile

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