Why do I get that Google is not enabled in my Firebase if I already enabled it?

 google()
    {
        console.log("I am in google method.");
        let provider = new firebase.auth.GoogleAuthProvider();
        let promise = firebase.auth().signInWithPopup(provider);

        promise.then(result => {
            let user = result.user;
            console.log(result);
            firebase.database().ref('users/' + user.uid).set({
                email: user.email,
                name: user.displayName
            });
        });
        promise.catch(e => {
            let msg = e.message;
            console.log(msg);
        });
    }