Fatal Error, Amazon Keys

What you should do if you encounter this error:

Fatal error: Uncaught exception ‘Exception’ with message ‘No Access Key or Secret Key has been set’ in /home/content/wp-content/plugins/amz-aff-store/lib/scripts/amazon/aaAmazonWS.class.php:71

Check your Amazon Keys, make sure you don't have any white spaces, also make sure that you keys are valid.