Error when trying to Scaffold a model

I'm building a Razor Page app using ASP.NET 2017. When I run the command

dotnet aspnet-codegenerator razorpage -m Activity -dc CongContext -udl -outDir Page\Activities --referenceScriptLibraries

This error appears:

Could not load file or assembly 'Microsoft.EntityFrameworkCore, Version=2.0.3.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I stopped and restarted VS, I've also cleaned and build the solution. Attached jpg shows the code I typed and the results

This is because of different versions of packages. Check the 'Dependencies' node of your project. The Microsoft.EntityFrameworkCore and Microsoft.EntityFrameworkCore.Design must have same 2.0.3 versions.

If not, delete and re-add them from [Tools] menu > [Nuget Package Manager]. Also delete the Migrations folder and repeat instructions as listed here. For more info, you may take a look at this comment