Cannot create new Assembly of type ".NET Standard"

Reported by Carsten Schuette Sep 26, 2017 at 08:02 AM windows 10.0 visual studio 2017 version 15.4 preview

When I try to create a new assembly of .NET Standard type, I get the following error:

The Visual Studio component cache is out of date (assembly: Microsoft.VisualStudio.Web.MicrosoftAzure.AzureFunctions, Version=15.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a). Please restart Visual Studio.

Rebuilding the MEF cache did not help. Only way to fix this is to uninstall Azure Functions extensions.

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Holger Romey · Oct 17, 2017 at 09:03 AM 0

The same happens to me. And only with .NETStandard-projects

Alexandru Ghiondea [MSFT] · Jun 26 at 06:44 PM 0

Thank you for your feedback! Unfortunately, right now we don't have enough information to investigate this issue and find a solution. If this is still an issue for you, please update to our latest version. If you are still able to repro it, please provide us with more info! Thank you for helping us build a better Visual Studio!

Best Solution

Added a solution by Boris Lehečka · Oct 19, 2017 at 10:02 AM

I had the same problem/error. I use Czech UI localization, and I had to disable "Microsoft Azure WebJobs Tools" extenstion: Tools > Extensions and updates.. > Microsoft Azure WebJobs Tools >> Disable and restart Visual Studio (restarting VS as administrator is not needed).

In English localization, there is no extension named "Microsoft Azure WebJobs Tools", but there is "Azure Function and Web Jobs Tools", and even it's not disabled adding .NET Core assembly works fine.

Maybe there are some inconsistecies between localized versions of Visaul Studio or extensions.

I use last update of Visual Studio 15.4.0 and Windows Fall Creators Update Windows 10 Pro, version 1703, build 15063.674.

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Georg Dangl · Oct 25, 2017 at 01:46 PM 0

I can confirm it's the same with English localization on a German Windows 10. I can reproduce the error on three different machines. Disabling the "Azure Functions and Web Job Tools" solves the problem.

Added a solution by Romey Holger · Oct 19, 2017 at 01:07 PM

I also found a solution for this:

► In the VS2017 Installation tool i have updated my configuration by deactivating the "Azure Development"-section.

After that new configuration has been applied, i activated that section again and everything works fine.

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