Error: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp()

Question

I have a firebase database linked up to two apps, one being an iOS app and another being a web app coded in node.js which is a basic algorithm that sets data to the database

Answer 1

YOU CALL THIS IN JADE: firebase.initializeApp(config); IN THE BEGIN OF THE FUNC

script.
    function signInWithGoogle() {
        firebase.initializeApp(config);
        var googleAuthProvider = new firebase.auth.GoogleAuthProvider
        firebase.auth().signInWithPopup(googleAuthProvider)
        .then(function (data){
            console.log(data)
        })
        .catch(function(error){
            console.log(error)
        })
    }