Flutter Error : No Firebase App ‘[DEFAULT]’ has been created – call Firebase.initializeApp() in Flutter and Firebase

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How to solve Flutter Error : No Firebase App ‘[DEFAULT]’ has been created – call Firebase.initializeApp() in Flutter and Firebase

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here Is all possible solution given https://fluttercorner.com/no-firebase-app-default-has-been-created-call-firebase-initializeapp-in-flutter-and-firebase/