Your project does not reference ".NETFramework,Version=v4.7.2" framework. Add a reference to ".NETFramework,Version=v4.7.2" in the "TargetFrameworks" property of your project file and then re-run NuGet restore.

visual studio 2017 version 15.8 windows 10.0

dylan reported Aug 21, 2018 at 09:23 PM

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Candy Zhang [MSFT] · Aug 23, 2018 at 03:09 AM 0

wally.highsmith · Sep 26, 2018 at 07:34 PM 0

Tom Meschter [MSFT] · Nov 26, 2018 at 08:37 PM 0

Juan José Mejia [MSFT] · Dec 04, 2018 at 07:15 PM 0

Dan Friedman Juan José Mejia [MSFT] · Dec 17, 2018 at 08:06 PM 0

Juan José Mejia [MSFT] Dan Friedman · Dec 17, 2018 at 09:02 PM 3

Mateusz Stepniak Juan José Mejia [MSFT] · Feb 05 at 11:33 AM 0

Roman Romaniv · Jan 10 at 05:02 PM 0

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Solution by Max Jones · Aug 29, 2018 at 10:48 AM

I came accross this issue aswell. I found that the issue for me was that these projects had a 'project.assets.json file' in the obj folder - This file seems to point at the previous .NET Framework, not sure what generated this or when (An older VS most likely) but a clean does not delete this file. I went through and manually deleted the bin and obj folders for all these projects, and then I was able to build without this error.

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soeren.boisen · Sep 27, 2018 at 08:42 AM 0

Magnus Österlund · Jan 15 at 09:30 AM 0

Chrome Magnus Österlund · Mar 07 at 06:49 PM 0

Solution by Andy Martin · Oct 26, 2018 at 03:13 PM

Relevant solution that worked for me: https://stackoverflow.com/a/52075493/42514

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Solution by Celal Ak · Aug 27, 2018 at 07:49 AM

if any NuGet package is not installed on the project, the specified problem occurs. Ypo can add System.AppContext NuGet Package.

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