EF dbcontext scaffold (no replies)

Following the steps outlined in docs to scaffold an existing MySQL database, I keep getting an Argument Null Exception with the parameter named language. I have the screen output -- basically, a mini stack trace -- and can post if needed. But, it looks like the error is triggered at:

Microsoft.EntityFrameworkCore.Design.Internal.DatabaseOperations..ctor(IOperationReporter reporter, Assembly startupAssembly, String pro
jectDir, String rootNamespace, String language)

The database is being used for ASP.NET identity in an EF CORE web application.

I would really appreciate any help.

Thanks,

Randy