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

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?

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
                yes thank you. After running this command, I was able to upgrade to Microsoft.AspNetCore.App, replacing Microsoft.AspNetCore.All
– Colbs
                Aug 20, 2018 at 16:02
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!
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.
        
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