Your startup project doesn't reference Microsoft.EntityFrameworkCore.Design

Question

I have 2 projects in my solution, I have a project with Entity Framework Core installed:

And in the other ASP.NET Web API project I have these packages:

Answer 1

Please make sure You have installed below packages. I was also getting same error and Installed below packages and it worked for me.

Microsoft.EntityFrameworkCore.SqlServer
Microsoft.EntityFrameworkCore.Design
Microsoft.EntityFrameworkCore.Tools

Answer 2

This happen for me when

Both Entity Framework Core and Entity Framework 6 are installed. The Entity Framework Core tools are running. Use 'EntityFramework6\Add-Migration' for Entity Framework 6.

solution was EntityFrameworkCore\Add-Migration

Answer 3

More a workaround than a solution, I ended up unloading the startup project from the solution. Ran the migration, added the project back to the solution. I don't expect to have many migrations, so it worked for me. What baffles me is that I have a solution with similar features and I didn't have the same issue.