I am getting this error while implementing the react-routing here is my code
http://codepen.io/anon/pen/VmOgyy?editors=1010

Error

react.min.js:16 Uncaught Error: Minified React error #130; visit http://facebook.github.io/react/docs/error-decoder.html?invariant=130&args[]=object&args[]= for the full message or use the non-minified dev environment for full errors and additional helpful warnings.

    at r (react.min.js:16)

    at p.a [as _instantiateReactComponent] (react.min.js:16)

    at performInitialMount (react.min.js:13)

    at p.mountComponent (react.min.js:13)

    at Object.mountComponent (react.min.js:15)

    at i (react.min.js:14)

    at r.perform (react.min.js:16)

    at s (react.min.js:14)

    at r.perform (react.min.js:16)

    at Object.batchedUpdates (react.min.js:14)

Could you please tell me why it is showing this error

var Router = ReactRouter;

var DefaultRoute = Router.DefaultRoute;

var Link = Router.Link;

var Route = Router.Route;

var browserHistory = Router.browserHistory;

var RouteHandler = Router.RouteHandler;



class First extends React.Component {

  render() {

    return <h1>Hello word</h1>;

  }

}



class Second extends React.Component {

  render() {

    return <h1>Second</h1>;

  }

}



ReactDOM.render( <Router history={browserHistory}>

        <Route path=/ component={First}/>

    </Router>,document.getElementById('root')

)