react-router-v4-example  npm start failing due to error in server.js

Trying out the react-router-v4-example, npm start is failing because of error in 
```
npm ERR! redux-react-session-example@0.1.0 start: `babel-node tools/server.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the redux-react-session-example@0.1.0 start script.

```