Adding scaffolding login register in ASP.NET Core broke my project

I can't add scaffolding identity register login.

I had no errors before adding these, but suddenly, the project finds tens of errors after trying to add identity to the project.

Example of error:

Error CS1061
'EntityTypeBuilder' does not contain a definition for 'Navigation' and no accessible extension method 'Navigation' accepting a first argument of type 'EntityTypeBuilder' could be found (are you missing a using directive or an assembly reference?)