react-router : run is not a function
Since the release of React Router v1.0, the run method has been removed, these breaking changes are documented in the upgrade guide. Your code would roughly translate to this:
ReactDOM.render(<Router>{routes}</Router>, document.getElementById('app')) https://github.com/rackt/react-router/blob/832c42946c874fe56ffde0066b1088054311cb98/CHANGES.md