Version conflict detected for Microsoft.CodeAnalysis.Common. Reference the package directly from the project to resolve this issue

Question

I want to add the FluentValidation Nuget package in my asp.net core app through Nuget Package Manager.While adding I get this error:

Severity Code Description Project File Line Suppression State Error Version conflict detected for Microsoft.CodeAnalysis.Common. Reference the package directly from the project to resolve this issue. Project Name -> FluentValidation.AspNetCore 7.6.103 -> Microsoft.AspNetCore.Mvc 2.1.0 -> Microsoft.AspNetCore.Mvc.TagHelpers 2.1.0 -> Microsoft.AspNetCore.Mvc.Razor 2.1.0 -> Microsoft.CodeAnalysis.Razor 2.1.0 -> Microsoft.CodeAnalysis.Common (>= 2.8.0) Project Name -> Microsoft.VisualStudio.Web.CodeGeneration.Design 2.0.0 -> Microsoft.VisualStudio.Web.CodeGenerators.Mvc 2.0.0 -> Microsoft.VisualStudio.Web.CodeGeneration 2.0.0 -> Microsoft.VisualStudio.Web.CodeGeneration.EntityFrameworkCore 2.0.0 -> Microsoft.VisualStudio.Web.CodeGeneration.Core 2.0.0 -> Microsoft.VisualStudio.Web.CodeGeneration.Templating 2.0.0 -> Microsoft.VisualStudio.Web.CodeGeneration.Utils 2.0.0 -> Microsoft.CodeAnalysis.CSharp.Workspaces 2.3.1 -> Microsoft.CodeAnalysis.Workspaces.Common 2.3.1 -> Microsoft.CodeAnalysis.Common (= 2.3.1).

How can I solve this error?

Answer 1

I had the same problem and was upgrading to 2.1, but for some reason I needed to manually upgrade my Microsoft.CodeAnalysis.Common package from 2.8.0 to 2.8.2

Install-Package Microsoft.CodeAnalysis.Common -Version 2.8.2

Answer 2

Just faced the same issue. Unfortunately, this package refers to .net core 2.1, which is incompatible with 2.0.

Here's how I managed to resolve this issue:
- Install the 2.1 SDK from https://www.microsoft.com/net/download/windows
- Follow migration instructions from https://learn.microsoft.com/en-us/aspnet/core/migration/20_21?view=aspnetcore-2.1

Hope it helps!

Answer 3

If you're project is running under .NET Core 3.1 LTS Then please install the following package into your targeted project.

Install-Package Microsoft.CodeAnalysis.Common -Version 3.6.0

And then

Install-Package Microsoft.CodeAnalysis.CSharp.Workspaces -Version 3.6.0

This will resolve your problem.