Could not load file or assembly 'System.ValueTuple Visual Studio 2017 15.8 node js project

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I have installed vs2017 15.8. If I open a console C# app it opens fine. However trying to open node js project throws the following error. Has anyone managed to solve it?

Could not load file or assembly 'System.ValueTuple, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

node.js
visual-studio
asked on Stack Overflow Aug 27, 2018 by user1131926 • edited Nov 19, 2018 by abatishchev

3 Answers

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I had the same problem. I could solve the problem by installing ".NET Framework 4.7.2"

Install-Source: https://support.microsoft.com/de-de/help/4054530/microsoft-net-framework-4-7-2-offline-installer-for-windows

After the Installation i have rebooted my System.

answered on Stack Overflow Aug 30, 2018 by mc-hollin • edited Aug 31, 2018 by mc-hollin
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I ran into the same issue and as suggested by mc-hollin the installation of 4.7.2 worked for me as well.

Please see the installation steps below:

  1. Open this link : https://www.microsoft.com/net/download/thank-you/net472

    If the above link does not work please go to https://www.microsoft.com/net/download/dotnet-framework-runtime and proceed from there by selecting the correct framework.

  2. This will initiate the downloading of NDP472-KB4054531-Web.exe in your system

  3. Once the downloading has finished, please start the installation by double clicking the exe and let the installation begin. This could take a while based on the speed of your internet connection.
  4. A restart after the installation is mandatory.
answered on Stack Overflow Sep 6, 2018 by ajaysinghdav10d
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I just want to add to the other answers.

Remove System.valuetuple from references. Otherwise it doesn't work and I do not know why. Basically valuetuple is already in 4.7.2 and so if you use visual studio 2019 you're all set.

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answered on Stack Overflow May 16, 2019 by user4951

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