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.

Reported by dylan Aug 21 at 09:23 PM visual studio 2017 version 15.8 windows 10.0

All projects in my solution have been set to target net472. This was a very painful manual process by the way.

After 33 projects targets were changed, a ridiculous error now shows preventing anything from building.

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

We appreciate you taking the time to report this problem. We are currently prioritizing problems that are impacting a broad set of our customers, so we may not be able to investigate this one immediately. We know this problem is important to you, so we will continue to monitor it.

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

Dylan,

For migrating projects to a new .Net version, for future reference, see "Target Framework Migrator" for migrating visual studio projects to later versions of .Net.
https://marketplace.visualstudio.com/items?itemName=PavelSamokha.TargetFrameworkMigrator

Also, sometimes the "Target Framework Migrator" project will not be updated to support the latest version of .Net, but you can download the source\configuration and update it yourself to support the latest version. I had to do this recently migrating .Net 4.6.2 to .Net 4.7.2.

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Added a solution by Max Jones · Aug 29 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 at 08:42 AM 0

This was my problem exactly. Thanks for the tip! MS please fix this bug in Visual Studio/NuGet integration. It is pretty dumb that we have to go around deleting these files manually.

Added a solution by Celal Ak · Aug 27 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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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.

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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.

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