问导出默认值不起作用webpack，reactjs

EN

 5:9  App not found in './components/App'  import/named

import React from 'react';
import ReactDOM from 'react-dom';
import {Router,Route,IndexRoute,browserHistory} from 'react-router';
import { Provider } from 'react-redux';
import {App} from './components/App';
import {HomePage} from './components/HomePage';

import configureStore from './store/configureStore.js';
import { syncHistoryWithStore } from 'react-router-redux';



const store = configureStore();

const history = syncHistoryWithStore(browserHistory, store);
ReactDOM.render(
    <Provider store={store}>
        <Router history={history}>
            <Route path="/" component={App}>
                <IndexRoute component={HomePage}/>



            </Route>


        </Router>

    </Provider>,
    document.getElementById('app')
);

import React, { PropTypes } from 'react';


const App = (props) => {
  return (
    <div>
      {props.children}
    </div>
  );
};

App.propTypes = {
  children: PropTypes.element
};

export default App;