Package X is not compatible with netstandard2.0

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I created a .NET Standard v2.0 project in Visual Studio 2017 v15.3.1 and I'm unable to install "Microsoft.EntityFrameworkCore 2.0.0" package in it (by Nuget 4.3). Previously the .NET SDK and Runtime, both 2.0.0, were installed.

The errors I get follow this pattern: "Package X is not compatible with netstandard2.0 (.NETStandard,Version=v2.0)." (i.e. System.Reflection.TypeExtensions 4.1.0).

What could it be causing these errors?

EDIT: I'll show the exact warnings and errors with an example (there are too many).

Restoring packages for [.csproj path]...

Warning:

Package "System.Collections 4.3.0" was restored using ".NETFramework,Version=v4.6.1" the project target framework ".NETStandard,Version=v2.0". This may cause compatibility problems.

...

Error:

Package Remotion.Linq 2.1.1 is not compatible with netstandard2.0 (.NETStandard,Version=v2.0). Package Remotion.Linq 2.1.1 supports:

net35 (.NETFramework,Version=v3.5)
net40 (.NETFramework,Version=v4.0)
net45 (.NETFramework,Version=v4.5)
netstandard1.0 (.NETStandard,Version=v1.0)
portable-net45+win8+wp8+wpa81 (.NETPortable,Version=v0.0,Profile=Profile259)

...

Error restoring package. Reverting package changes for 'ClassLibrary1'.

Time elapsed: 00:00:02.4689637

========== Ended ==========

Opportina answered 20/8, 2017 at 16:17 Comment(8)

System.Reflection.TypeExtensions 4.1.0 won't work, it's too old. You will need version 4.4 – Kedron 20/8, 2017 at 16:35

Question editted with exact errors. @Kedron Why is it taking packages not compatible with .net standard 2.0? – Opportina 20/8, 2017 at 16:46

Well you have installed some weird packages here. What is Remotion.Linq? That's not part of the standard library. – Kedron 20/8, 2017 at 16:48

It's actually a dependence from Microsoft.EntityFrameworkCore, but it seems it takes an old version one. – Opportina 20/8, 2017 at 16:50

Oops I missed that. Still odd though, have you tried creating a fresh project? – Kedron 20/8, 2017 at 16:54

Yeah, same error. Strange that EntityFrameworkCore dependes on a version of a package (i.e. it accepts Remotion.Linq >= 2.1.1) but when that package is being restored, it shows the error "not compatible with .netstandard2.0". – Opportina 20/8, 2017 at 17:18

Are you sure you have the latest versions of everything installed? – Kedron 20/8, 2017 at 17:19

I think so... .NET Core Runtime 2.0 .NET Core SDK 2.0. Pic: imgur.com/a/VYeu6 – Opportina 20/8, 2017 at 17:23

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Issue solved installing, independently, newer versions for each of the packages' dependencies which were showing error, so that the big package "Microsoft.EntityFrameworkCore 2.0.0" gets installed at last.

Hope it helps.

Edited: It happened to me another time and tried a faster solution. The key was deleting Nuget's cache from the packages' manager configuration.

Opportina answered 20/8, 2017 at 19:49 Comment(3)

What worked for me was using the Package Manager console in Visual Studio to install instead of the Manager Packages tool for the project. – Allege 17/10, 2018 at 12:52

how di you delte nugets cache? was it by using dotnet nuget locals all –clear – Reganregard 27/9, 2019 at 11:54

what worked for me. removed reference to the project from the .csproj, and then clearing the nuget cache, then re-install library – Pears 26/7, 2023 at 14:13

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Clicking the "Clear all Nuget Caches" will resolve issue.

Faerie answered 15/11, 2019 at 10:39 Comment(1)

This helped with same situation in VS2019 & 22 – Gramercy 16/11, 2022 at 7:19

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