Publish the Project leads to error

On this exercise in Exercise - Publish the result to the pipeline I publish the build to the pipeline by adding this to the Azure Pipeline file.

- task: DotNetCoreCLI@2
  displayName: 'Publish the project - Release'
  inputs:
    command: 'publish'
    projects: '**/*.csproj'
    publishWebProjects: false
    arguments: '--no build --configuration Release --output $(Build.ArtifactStagingDirectory)/Release'
    zipAfterPublish: true

- task: PublishBuildArtifacts@1
  displayName: 'Publish Artifact: drop'
  condition: succeeded()

But after the pipeline runs, I get these errors.

##[error]Error: The process '/opt/hostedtoolcache/dotnet/dotnet' failed with exit code 1 ##[warning].NET 5 has some compatibility issues with older Nuget versions(<=5.7), so if you are using an older Nuget version(and not dotnet cli) to restore, then the dotnet cli commands (e.g. dotnet build) which rely on such restored packages might fail. To mitigate such error, you can either: (1) - Use dotnet cli to restore, (2) - Use Nuget version 5.8 to restore, (3) - Use global.json using an older sdk version(<=3) to build Info: Azure Pipelines hosted agents have been updated and now contain .Net 5.x SDK/Runtime along with the older .Net Core version which are currently lts. Unless you have locked down a SDK version for your project(s), 5.x SDK might be picked up which might have breaking behavior as compared to previous versions. You can learn more about the breaking changes here: https://docs.microsoft.com/en-us/dotnet/core/tools/ and https://docs.microsoft.com/en-us/dotnet/core/compatibility/ . To learn about more such changes and troubleshoot, refer here: https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/build/dotnet-core-cli?view=azure-devops#troubleshooting ##[error]Dotnet command failed with non-zero exit code on the following projects : [ '/home/vsts/work/1/s/Tailspin.SpaceGame.Web/Tailspin.SpaceGame.Web.csproj' ] Finishing: Publish the project - Release

Did the exercise files use outdated code that is no longer compatible with modern agents? If so, what do I have to do to fix this problem?

This question is related to the following Learning Module