Packages are not compatible with netcoreapp2.0

11
votes

Today this error ocurred again. Visual Studio does not recognize most of the packages instaled in Microsoft.AspNetCore.All but I'm also getting problems with:

  • Microsoft.Extensions.Logging.Debug
  • Microsoft.VisualStudio.Web.CodeGenerators.Mvc
  • Microsoft.EntityFrameworkCore.Tools.DotNet

The error message is like this for every package:

The Microsoft.VisualStudio.Web.CodeGenerators.Mvc 2.0.0 package is not compatible with netcoreapp2.0 (.NETCoreApp, Version = v2.0). The Microsoft.VisualStudio.Web.CodeGenerators.Mvc 2.0.0 package supports: netstandard2.0 (.NETStandard, Version = v2.0)

I got pass this issue before doing the following:

  • Updating VS to version 15.3.1
  • Updating SDK to version 2.0

Now, I have updated NuGet.Commandline to 4.3 but the problem persists.

I'm also getting this alert:

There is no way to resolve the conflict between "System.Collections.NonGeneric, Version = 4.1.0.0, Culture = neutral, PublicKeyToken = b03f5f7f11d50a3a" and "System.Collections.NonGeneric, Version = 4.0.1.0, Culture = neutral, PublicKeyToken = b03f5f7f11d50a3a ". "System.Collections.NonGeneric, Version = 4.1.0.0, Culture = neutral, PublicKeyToken = b03f5f7f11d50a3a" will be chosen arbitrarily. Application D: \ Visual Studio \ MSBuild \ 15.0 \ Bin \ Microsoft.Common.CurrentVersion.targets 1964

Any other update I shall look into? Any help is welcome. Thanks

4
c#.netvisual-studio

4 Answers

11
votes

If you are using dotNET CLI, then just run this command,

dotnet nuget locals all --clear
5
votes

Solved by updating Visual Studio to version 15.3.3

It seems this will be happen often until aspnetcore2.0 stabilizes itself.

0
votes

I Solved it by clearing global-packages folder. Run either :

$ nuget locals global-packages -clear

or 

$ dotnet nuget locals global-packages --clear
0
votes

If anyone is getting this error or a similar error when running pipelines (builds) in Azure DevOps, then there is a different fix for that. In order to fix the pipeline, we had to add a NuGet tool installer task that forced the current build to use a version of NuGet >= 5.8.

Here is a screenshot of the task: enter image description here

For complete reference, here is the error message that we were getting on Azure DevOps pipeline:

Errors in G:...\ProjectName.Test.csproj Package Moq 4.12.0 is not compatible with netcoreapp2.2 (.NETCoreApp,Version=v2.2). Package Moq 4.12.0 supports: - net45 (.NETFramework,Version=v4.5)