Module not found in React

I am new to React. I have create new react app using following command.

create-react-app app-name --scripts-version custom-react-scripts-version

Inside src folder of that app i have created 2 new folders say Grid and Title and created files Grid.js and Title.js in respected folder.

Grid.js

import React from 'React';

export default class Grid extends React.Component {
    render() {
        return (
            <div>
                <h1>Grid</h1>
            </div>
        );
    }
}

Title.js

import React from 'React';

const Title = () =>  {
    return (
        <div>
            <h1>Title</h1>
        </div>
    );
}

export default Title;

Now, i try to import both into App.js file it won't.

import Title from './Title/Title';
import Grid from './Grid/Grid';

It shows following error.

Failed to compile.

./src/Grid/Grid.js Module not found: D:\ReactAppCSS\node_modules\React\index.js does not match the corresponding path on disk react.

Same for Title.js.

Any help would greatly appreciated.