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Possible Unhandled Promise Rejection Network Error in React Native

I setup my local server using express.js, That simply handle request and return simple message.

app.get('/hello', (req, res) => {
    res.send('Hello world !');

I executed server and test it on web-browser, it works well.

Simply I want to do that on my react-native app.

this is my action.js file

import axios from 'axios';

exports.helloButtonPressAct = (email, password) => {
    return function (dispatch) {
        return axios.get('http://localhost:3000/hello')
            .then(function (response) {

                // and create action obj here
                // dispatch(someAction(...))
            .catch(function (error) {
                throw error;

It only return catch() result.

Possible Unhandled Promise Rejection (id: 0): Network Error Error: Network Error at createError ...

enter image description here

Maybe something wrong but I couldn't find what is it.

How can I fix this?