Flutter Web App, Firebase.auth not working. Tried to call a non-function, such as null. 'dart.global.firebase.auth'

Question

I am trying to implement a simple Flutter Web App, with Firebase Auth.

I am getting the error NoSuchMethodError: tried to call a non-function, such as null: \'dart.

Answer 1

Turns out I placed this

In the wrong place.

It should be inside the tag.

Side note, I had this twice, so I deleted the one below.

Finally, thanks to David Iglesias for his answer here: https://github.com/FirebaseExtended/flutterfire/issues/2860#issuecomment-651313186.