TypeError: Class constructor cannot be invoked without 'new'

I'm trying to use React and Node to create an application. However, I'm having trouble creating a component using other components and then rendering that "master" component. In a Components.js file, I have multiple components defined, like:

/** @jsx React.DOM */

var React = require('react');
var ReactDOM = require('react-dom');
var Component = require('../components/Component');
class Comp1 extends React.Component {
    render() {
        return (
            <div>
               some stuff here
            </div>
        )
    }
};

...

module.exports = Master = React.createClass({
    render: function() {
        return (
            <div>
                <Comp1 />
                <Comp2 />
            </div>
        )
    }
});

Then, in my routes.js, I have:

var JSX = require('node-jsx').install();
var React = require('react');
var ReactDOM = require('react-dom/server');
var Component = require('./components/Component');

module.exports = {

    index: function(req, res) {
        var markup = 
             ReactDOM.renderToString(React.createElement(Component));

        res.render('home', {
            markup: markup
        });
    }

};

And in my app.js, I have:

/** @jsx React.DOM */

var React = require('react');
var Component = require('./components/Component');

ReactDOM.render(
  <Component />,
  document.getElementById('root')
);

I think I'm incorrectly nesting the components inside Master and then incorrectly exporting Master, because I receive the error message "TypeError: Class constructor Comp1 cannot be invoked without 'new'". I'm not quite sure what to do; any help would be appreciated, thanks!

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