npm throwing error in react - node.js

Question

Following is my code in which npm is throwing error. Earlier it was working fine, but when I have copied the same code in different directory, ran npm install and now trying to run npm start. It is throwing error :
ERROR in ./www/plugins/entry.js
Module build failed: SyntaxError: Unexpected token (7:8)
5 | import routes from './routes/routes'
6 |
> 7 | render((<Router history={browserHistory} routes={routes} />),document.getElementById('app'))
Code is :
import React from 'react';
import { render } from 'react-dom';
import { Router , browserHistory } from 'react-router';
import routes from './routes/routes';
render((<Router history={browserHistory} routes={routes} />), document.getElementById('app'));
package.json
{
"name": "userapp3",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"start": "webpack --config www/server/webpack.js --watch --colors",
"webp": "concurrently 'node www/server/index.js' 'webpack --config www/server/webpack.js --watch --colors'",
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"babel": "^6.5.2",
"babel-core": "^6.10.4",
"babel-loader": "^6.2.4",
"babel-preset-es2015": "^6.9.0",
"babel-preset-react": "^6.11.1",
"extract-text-webpack-plugin": "^1.0.1",
"minifier": "^0.8.0",
"node-sass": "^3.8.0",
"react": "^15.2.1",
"react-dom": "^15.2.1",
"react-helmet": "^3.3.0",
"react-router": "^2.5.2",
"react-select2": "^4.0.1",
"sass-loader": "^4.0.0",
"webpack": "^1.13.1"
},
"devDependencies": {
"css-loader": "^0.23.1",
"style-loader": "^0.13.1"
}
}