I'm Using On Windows 10 But Example Fails

Hello, I am trying to use your library but so far I got only errors. Perhaps you can let me know where I am wrong. My code:

```
import React, { Component } from 'react';
import SortableTree from 'react-sortable-tree';
import FileExplorerTheme from 'react-sortable-tree-theme-file-explorer';

export default class Tree extends Component {
constructor(props) {
super(props);

this.state = {
treeData: [{ title: '.', children: [{ title: 'index.js' }] }],
};
}

render() {
return (

Instead of './src/ I made it '.' since there is no './src'. However, I intend to use this to display a specific folder on the Windows PC so please let me know what to do. Thank you!