How can I resolve the NU1100 error?

Question

C++ / C#

Alas, I am a complete zero in C#. They gave me a simple homework at the university, to finish one class. When checking the project through the dotnet test command, an error occurs:

D:\my\homework\2021_december\c#\PracticeOne\Practice\Test\Test.csproj : error NU1100: Failed to resolve 'Microsoft.NET.Test.Sdk (>= 16.11.0)' for 'net6.0' . [D:\my\homework\2021_december\c#\PracticeOne\Practice\Practice.sln]
D:\my\homework\2021_december\c#\PracticeOne\Practice\Test\Test.csproj : error NU1100: Failed to resolve " NUnit (>= 3.13.2)" for "net6.0". [D:\my\homework\2021_december\c#\PracticeOne\Practice\Practice.sln]
D:\my\homework\2021_december\c#\PracticeOne\Practice\Test\Test.csproj : error NU1100: Failed to resolve " NUnit3TestAdapter (>= 4.0.0)" for "net6.0". [D:\my\homework\2021_december\c#\PracticeOne\Practice\Practice.sln]
D:\my\homework\2021_december\c#\PracticeOne\Practice\Test\Test.csproj : error NU1100: Failed to resolve 'coverlet.collector (>= 3.1.0)' for 'net6.0'. [D:\my\homework\2021_december\c#\PracticeOne\Practice\Practice.sln]
Failed to restore D:\my\homework\2021_december\c#\PracticeOne\Practice\Test\Test.csproj (in 534 ms) .
Projects updated for recovery: 1 of 2.

Here is the actual Test.csproj:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <Nullable>enable</Nullable>

    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
    <PackageReference Include="NUnit" Version="3.13.2" />
    <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
    <PackageReference Include="coverlet.collector" Version="3.1.0" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\Practice\Practice.csproj" />
  </ItemGroup>

</Project>

How can I solve the problem? I understand that dependencies do not last. But what should I do in this case?

Answer 1

https://docs.microsoft.com/ru-RU/nuget/reference/e...
The error is not in the project configuration (the code you posted), but rather in the code itself or in the presence of incompatible packages. More details about the error on the link above.