No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp() in Flutter and Firebase

Question

I am building a flutter App and I have integrated Firebase but I keep getting this error when I click on a button either to register, login or logout. I have seen other peop

Answer 1

@peter's answer is Perfect!! but If you still get error in your code and following flutter firebase codelab, note that those tutorials are outdated as of August 2020 and not updated yet. you need to do many other changes like:

• replace .data with .data()
• replace updateData with update

Hope this may help some newbies like me.