编译正常的，但浏览器一直报这个错，请教

webpack.config.js

module.exports={
    entry:"./entry.js",
    output:{
        filename:"bundle.js"
    },
    module:{
        loaders:[
            {
                test:/\.js$/,
                loader:'babel-loader?presets[]=es2015&presets[]=react',
                exclude:/node_modules/
            }
        ]
    }
}

entry.js

import React from "react";
import {render} from "react-dom";
import {Router,Route,browserHistory,IndexRoute} from "react-router";
import app from "./modules/app";
import about from "./modules/about";
import repos from "./modules/repos";


render(
    
        
            
            

        
    ,
    document.getElementById('app')
)

app.js

import React from "react";
import NavLink from "./NavLink";

export default React.createClass({
    render(){
        return (
            

                
react
                

                    
about
                    
repos
                
            

        )
    }
})

about.js

import React from "react";

export default React.createClass({
    render(){
        return (
            
about
        )
    }
})

repos.js

import React from "react";

export default React.createClass({
    render(){
        return (
            
repos
        )
    }
})

NavLink.js

import React from "react";
import {Link} from "react-router";

export default React.createClass({
    render(){
        return (
            
        )
    }
})

index.html

style.css

.active{
    color:red;
}

package.json

{
  "name": "router",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.22.1",
    "babel-loader": "^6.2.10",
    "babel-preset-es2015": "^6.22.0",
    "babel-preset-react": "^6.22.0",
    "react": "^15.4.2",
    "react-dom": "^15.4.2",
    "react-router": "^3.0.2",
    "webpack": "^2.2.1"
  }
}