Creating NuGet package: NU5128 exception - not clear on how to fix

Question

I have a DLL addressing the .NET 4.7.1 library.

Probably irrelevant, but it's written in C# and consumes NuGet packages using the "packages.config" pattern, rather than the newer PackageReference configuration.

I publish this as a NuGet package (have been doing this for several years). But now when I execute the following:

nuget pack -Properties Configuration=Release

I get the following warning:

Error NU5128: Some target frameworks declared in the dependencies group of the nuspec and the lib/ref folder do not have exact matches in the other location. Consult the list of actions below: - Add a dependency group for .NETFramework4.7.1 to the nuspec

I don't have anything in the dependencies group of the nuspec:

<?xml version="1.0"?> 
<package >   
    <metadata>
        <id>*******</id>
        <version>*******</version>
        <title>*******</title>
        <authors>*******</authors>
        <owners>*******</owners>
        <requireLicenseAcceptance>false</requireLicenseAcceptance>
        <description>*******</description>
        <releaseNotes>*******</releaseNotes>
        <copyright>*******</copyright>
        <tags>*******</tags>
   </metadata> 
</package>

This consumes the following NuGet packages:

Microsoft.AspNet.WebApi.Client v5.2.7
Microsoft.AspNet.WebApi.Core v5.2.7
Microsoft.CodeAnalysis.FxCopAnalyzers v2.9.8
Microsoft.CodeAnalysis.VersionCheckAnalyzer v2.9.8
Microsoft.CodeQuality.Analyzers v2.9.8
Microsoft.NetCore.Analyzers v2.9.8
Microsoft.NetFramework.Analyzers v2.9.8
Newtonsoft.Json v12.0.3
StyleCop.Analyzers v1.1.118

When I look under the References, I see the following (used ~ to shorten the path):

Microsoft.CSharp ~.NETFramework\v4.7.1\Microsoft.CSharp.dll
Newtonsoft.Json ~\packages\Newtonsoft.Json.12.0.3\lib\net45\Newtonsoft.Json.dll
System ~\NETFramework\v4.7.1\System.dll
System.Configuration ~.NETFramework\v4.7.1\System.Configuration.dll
System.Core ~.NETFramework\v4.7.1\System.Core.dll
System.Data ~.NETFramework\v4.7.1\System.Data.dll
System.Data.DataSetExtensions ~.NETFramework\v4.7.1\System.Data.DataSetExtensions.dll
System.Net.Http ~.NETFramework\v4.7.1\System.Net.Http.dll
System.Net.Http.Formatting ~\packages\Microsoft.AspNet.WebApi.Client.5.2.7\lib\net45\System.Net.Http.Formatting.dll
System.Web.Http ~\packages\Microsoft.AspNet.WebApi.Core.5.2.7\lib\net45\System.Web.Http.dll
System.Xml ~.NETFramework\v4.7.1\System.Xml.dll
System.Xml.Linq ~.NETFramework\v4.7.1\System.Xml.Linq.dll

So to my mind, everything looks like it's .NET 4.7.1 compatible, so why this warning?

Following the details given in NuGet Warning NU5128, I therefore added a dependency group:

<?xml version="1.0"?> 
<package >   
    <metadata>
        <id>*******</id>
        <version>*******</version>
        <title>*******</title>
        <authors>*******</authors>
        <owners>*******</owners>
        <requireLicenseAcceptance>false</requireLicenseAcceptance>
        <description>*******</description>
        <releaseNotes>*******</releaseNotes>
        <copyright>*******</copyright>
        <tags>*******</tags>
        <dependencies>
          <group targetFramework=".NETFramework4.7.1" />
        </dependencies>
   </metadata> 
</package>

But this has no effect, I still get the error.

Does this answer your question? Nuget package creation - Class library that targets .NET framework 4.6.1 can not target correct framework — Paolo Fulgoni

kartheekp-ms kartheekp-ms · Accepted Answer · 2020-02-16T22:56:45

As per NU5128 doc, This warning was added during NuGet 5.3's development, and first was available in .NET Core SDK 3.0 Preview 9. NuGet/Home#8583 tracks an issue where the warning was being raised in too many scenarios. You can use the NoWarn MSBuild property (add $(NoWarn);NU5128 to any PropertyGroup in your project file). If you have multiple projects affected, you can use Directory.Build.targets to automatically add NoWarn to all projects

Add Nowarn to the project

Creating NuGet package: NU5128 exception - not clear on how to fix

3 Answers