Main js file for searchkit history error

App.js

import React, { Component } from 'react';
import {render} from 'react-dom';
import Searchkit from 'searchkit';

require('bootstrap/dist/css/bootstrap.css');
require('./styles/main.scss');

import KanbanBoardContainer from './KanbanBoardContainer';

render(<KanbanBoardContainer />, document.getElementById('root'));