F23 PROG1322 02.8 - ERROR - Different package versions mixed together in the Solution.
This can happen when packages get updated after we start the project. You can always specify the version to install with the "Package Manager Console" command line tool. Another option is to use the "Manage NuGet Packages for Solution..." tool, which allows you to install, maintain and update selected packages in the solution.
You can decide if you want to roll back the version on a package or update the others to match.
Note that some NuGet packages we will be installing in the course have different version numbers altogether so don't always expect to see the same number on all packages!