Change.txt

1) Open this file: app/design/frontend/rwd/default/template/configurableswatches/catalog/product/view/type/configurable/swatch-js.phtml

2) Change this:

<script type="text/javascript">
    document.observe('dom:loaded', function() {
        var swatchesConfig = new Product.ConfigurableSwatches(spConfig);
    });
</script>
To this:

<script type="text/javascript">
    document.observe('dom:loaded', function() {
        if (Product.ConfigurableSwatches) {
            var swatchesConfig = new Product.ConfigurableSwatches(spConfig);
        }
    });
</script>