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There was a conflict between "Mono.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" and "Mono.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756"

See original GitHub issue

ok, I see this entry about a Mono.Sharp conflict in error list as warning when I try to compile an the android app of xamarin.forms project which uses old packages.config:

There was a conflict between "Mono.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" and "Mono.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756".
1>    "Mono.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" was chosen because it was primary and "Mono.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" was not.
1>    References which depend on "Mono.CSharp, Version=2.0.5.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" [C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Mono.CSharp.dll].
1>        C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Mono.CSharp.dll
1>          Project file item includes which caused reference "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\ReferenceAssemblies\Microsoft\Framework\MonoAndroid\v1.0\Mono.CSharp.dll".
1>            Mono.CSharp
1>    References which depend on "Mono.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756" [].
1>        D:\Foo.App\packages\Xamarin.HotReload.1.4.19\lib
1>etstandard2.0\Xamarin.Forms.HotReload.Reloader.dll
1>          Project file item includes which caused reference "D:\Foo.App\packages\Xamarin.HotReload.1.4.19\lib
1>etstandard2.0\Xamarin.Forms.HotReload.Reloader.dll".
1>            Xamarin.Forms.HotReload.Reloader, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL
1>            D:\Foo.App\Foo.App\Foo.App\bin\Debug\Foo.App.dll
1>Found conflicts between different versions of "Mono.CSharp" that could not be resolved.