In Firebase Functions showing Warning, estimating Firebase Config based on GCLOUD_PROJECT. Initializing firebase-admin may fail - error message - firebase

Question

I do receive an error message while deploying.
In Firebase Functions showing Warning, estimating Firebase Config based on GCLOUD_PROJECT. Initializing firebase-admin may fail
I have already define all the apikey etc but the database is not linked dialogflow.
Please advise.
const functions = require('firebase-functions');
var config = {
apiKey: xxxxx,
authDomain: xxxxx,
databaseURL: xxxxx,
projectId: xxxxx,
storageBucket: xxxxx,
messagingSenderId: xxxxx,
;// your config object could be differ
const admin = require('firebase-admin');
admin.initializeApp(config);
process.env.DEBUG = 'dialogflow:debug'; // enables lib debugging statements
exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
console.log('Dialogflow Request headers: ' + JSON.stringify(request.headers));
console.log('Dialogflow Request body: ' + JSON.stringify(request.body));
const db = admin.database();
const action = request.body.queryResult.action;
if (action === 'product_description') {
const product = request.body.queryResult.parameters.Products.trim();
const ref = db.ref(`products/${product.toLowerCase()}/description`);
ref.once('value').then((snapshot) => {
const result = snapshot.val();
if (result === null) {
response.json({
fulfillmentText: `Product does not exists in inventory`
});
return;
}
response.json({
fulfillmentText: `Here is the description of ${product}: ${result}`,
source: action
});
}).catch((err) => {
response.json({
fulfillmentText: `I don't know what is it`
});
});
} else if(action === 'product_quantity') {
const product = request.body.queryResult.parameters.Products.trim();
const ref = db.ref(`products/${product.toLowerCase()}`);
ref.once('value').then((snapshot) => {
const result = snapshot.val();
if (result === null) {
response.json({
fulfillmentText: `Product does not exists in inventory`
});
return;
}
if (!result.stock) {
response.json({
fulfillmentText: `Currently ${product} is out of stock`,
source: action
});
} else {
response.json({
fulfillmentText: `We have ${result.stock} ${product} in stock`,
source: action
});
}
}).catch((err) => {
response.json({
fulfillmentText: `I don't know what is it`
});
});
} else {
response.json({
fulfillmentText: `I don't know what is it`
});
}
});`
This is the my package.json
{
"name": "dialogflowFirebaseFulfillment",
"description": "This is the default fulfillment for a Dialogflow agents using Cloud Functions for Firebase",
"version": "0.0.1",
"private": true,
"license": "Apache Version 2.0",
"author": "Google Inc.",
"engines": {
"node": "8"
},
"scripts": {
"start": "firebase serve --only functions:dialogflowFirebaseFulfillment",
"deploy": "firebase deploy --only functions:dialogflowFirebaseFulfillment"
},
"dependencies": {
"actions-on-google": "^2.12.0",
"firebase-admin": "^8.8.0",
"firebase-functions": "^3.3.0",
"dialogflow": "^0.12.1",
"dialogflow-fulfillment": "^0.6.1"
}
}