Get Started with iOS Authentication using SwiftUI, Part 1: Login and Logout, following guide error

I’m trying to learn how to code an app and I was following this guide to see how to add user authentication, but after I followed the whole thing, it gave me an error and I don’t know whats wrong

Hey there!

Can you share the link to the guide / quickstart / doc you are going through so we have some reference? Thank you!