Error when trying to import bootswatch theme

[Rajiv-Kulkarni]

I am trying to use the react-slingshot starter and getting this error after npm start:
ERROR in .//css-loader!.//less-loader!.//bootswatch/yeti/bootswatch.less
Module build failed: .box-shadow is undefined
@ C:\ReactJS\react-slingshot-master\react-slingshot-master\node_modules\bootswatch\yeti\bootswatch.less (line 25, column 4)
near lines:
border-top-color: @dropdown-divider-bg;
.box-shadow(none);
}
@ .//bootswatch/yeti/bootswatch.less 4:14-101 13:2-17:4 14:20-107
Child html-webpack-plugin for "index.html":

My About page in the demo app looks like this:
import React from 'react';
import {Link} from 'react-router';
import '../../node_modules/bootstrap/less/bootstrap.less';
import '../../node_modules/bootswatch/yeti/variables.less';
import '../../node_modules/bootswatch/yeti/bootswatch.less';
import '../styles/about-page.css';

// Since this component is simple and static, there's no parent container for it.
const AboutPage = () => {
return (

About

This example app is part of the React-Slingshot
starter kit.

Click this bad link to see the 404 page.

);
};

export default AboutPage;

Am I doing anything wrong here?

Thanks for any help.

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