I'm Using On Windows 10 But Example Fails

[doverradio]

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 (
      <div style={{ height: 400 }}>
        <SortableTree
          treeData={this.state.treeData}
          onChange={treeData => this.setState({ treeData })}
          theme={FileExplorerTheme}
        />
      </div>
    );
  }
}

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!