NuGet Error NU5030 - The license file 'LICENSE.txt' does not exist in the package

Question

I have an error in Visual Studio 17.5.1. My Visual Studio is up to date.

The error

The license file "LICENSE.md" does not exists in the package. NuGet Error NU5030

---

My project file (.csproj)

The files are located in a parent folder. SolutionFolder/ProjectFolder

I tried

1. From Microsoft NuGet Error NU5030 <None Include="../LICENSE.md" Pack="true" Visible="true" PackagePath="" />
2. As it was before this error

<None Include="../LICENSE.md">
        <Pack>True</Pack>
        <PackagePath></PackagePath>
</None>

3. 1 or 2. I copied the files in the same folder of project.

<None Include="LICENSE.md" Pack="true" Visible="true" PackagePath="" />

or

<None Include="LICENSE.md">
        <Pack>True</Pack>
        <PackagePath></PackagePath>
</None>

4. <None Include="$(MSBuildThisFileDirectory)LICENSE.md" Pack="true" PackagePath="" />
5. <None Include="$(SolutionDir)LICENSE.md" Pack="true" PackagePath="" />

Project.csproj

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <Nullable>enable</Nullable>
        <ImplicitUsings>enable</ImplicitUsings>
        <TargetFramework>net6.0</TargetFramework>
        <PackageId>$(AssemblyName)</PackageId>
        <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
        <PackageLicenseFile>License.md</PackageLicenseFile>
        <IncludeContentInPack>false</IncludeContentInPack>
        <VersionPrefix>27.0.0</VersionPrefix>
        <VersionSuffix></VersionSuffix>
        <Version>27.0.0</Version>
        <LangVersion>latest</LangVersion>
    </PropertyGroup>
    <ItemGroup>
        <None Include="License.md" Pack="true" PackagePath="" />
    </ItemGroup>
</Project>

Screenshots

Answer 1

Change IncludeContentInPack = true

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <Nullable>enable</Nullable>
        <ImplicitUsings>enable</ImplicitUsings>
        <TargetFramework>net6.0</TargetFramework>
        <PackageId>$(AssemblyName)</PackageId>
        <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
        <PackageLicenseFile>License.md</PackageLicenseFile>

         <IncludeContentInPack>true</IncludeContentInPack>

        <VersionPrefix>27.0.0</VersionPrefix>
        <VersionSuffix></VersionSuffix>
        <Version>27.0.0</Version>
        <LangVersion>latest</LangVersion>
    </PropertyGroup>
    <ItemGroup>
        <None Include="License.md">
            <Pack>true</Pack>
            <PackagePath></PackagePath>
            <Visible>True</Visible>
        </None>
    </ItemGroup>
</Project>

All 5 forms specified on this question works fine, after changing IncludeContentInPack = true.

IncludeContentInPack = false, ignores to add any content when pack operation is executed. If content is not added, the license file does not exists in the nuget package(NuGet Error NU5030).