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Editorial Team
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Asked: 2026-05-16T06:27:50+00:00

Error 1 The type ‘System.Tuple’ exists in both ‘c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\mscorlib.dll’ and ‘c:\Program

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Error 1 The type ‘System.Tuple’ exists in both ‘c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\mscorlib.dll’ and ‘c:\Program Files (x86)\FSharp-2.0.0.0\bin\FSharp.Core.dll’ C:\Users\Bent\documents\visual studio 2010\Projects\FSharpExtensionsCSharp\FSharpExtensionsCSharp\FSharpListEx.cs 51 41 FSharpExtensionsCSharp

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1 Answer

  1. Editorial Team

    It looks like you’re trying to use a 2.0/3.0/3.5 framework version of FSharp with 4.0. If you change your projects to target 3.5 or 3.0 or 2.0 etc. you should be fine.

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