Freelancer:
grimsage
More details needed
Hello. I also have the theme you are using ( Megashop ) and I'm trying to reproduce your error. Can you give me an exact link for the extension ? Because there are many that are named "Color swatch". Could it be this one: http://www.magentocommerce.com/magento-connect/gala-color-swatches-free-9787.html ?