getting error in firebase realtime database configuration in react native using expo CLI

Question

I am working on one app in which I need to insert some data into firebase realtime data base first I installed firebase using expo install firebase

here is my code

created one firebase.js file in which everything related to firebase configuration things are there

import * as firebase from 'firebase/app';
import { initializeApp, getApps } from 'firebase/app';
const firebaseConfig = {
  apiKey: “…………………..”,
  authDomain: “………………”,
  databaseURL: “…………”,
  projectId: “……………..”,
  storageBucket: “………….”,
  messagingSenderId: “…………….”,
  appId: “……………….”,
  measurementId: “…………….”,
};
let fb;
if (getApps.length === 0) {
  // initializeApp(firebaseConfig);
  fb = firebase.initializeApp(firebaseConfig, 'appname');

}

export default fb;

I am using that fb over here in app.js

import { getDatabase, ref, onValue, set } from 'firebase/database';
import { fb } from '../firebase'


const timeStamp = Math.floor(Date.now() / 1000);
    const insertKey =   "_" + timeStamp;
            
    const contactsDbRef = fb.app().database().ref('contacts/'+insertKey);
    
    contactsDbRef.set({
      name:'abc',
      number: '45454545454',
      email: '[email protected]',
    }).then(() => {
      console.log("Data updated")
    }).catch(e => console.log(e))