React simple routing

App.js

import React from 'react';
import ReactDOM from 'react-dom';
import Login from './Login.jsx';
//import SignUp  './SignUp.jsx'
import { Router, Route, hashHistory } from 'react-router';
import './App.css';

ReactDOM.render((
  <Router history={hashHistory}>
    <Route path="/" component={Login}/>
    <Route path="/signup" component={Login}/>
  </Router>
), document.getElementById('root'))

error console

warning.js:36 Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components).printWarning @ warning.js:36warning @ warning.js:60createElement @ ReactElementValidator.js:165(anonymous function) @ index.js:21(anonymous function) @ bundle.js:1363__webpack_require__ @ bundle.js:556fn @ bundle.js:87(anonymous function) @ multi_main:3(anonymous function) @ bundle.js:589__webpack_require__ @ bundle.js:556(anonymous function) @ bundle.js:579(anonymous function) @ bundle.js:582
invariant.js:38 Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.(…)

Login.jsx

import React, { Component } from 'react';

class Login extends Component {
  render() {
    return(
      <div className="Login">
        <button className="LoginButton">S'inscrire</button>
        <button className="LoginButton">Se connecter</button>
      </div>
    )
  }
}

export default Login