ERROR: Invalid domain for site key

This error message shows up as the page loads. I've checked everywhere that needs a site key, but can't find what I'm missing. All my files pass validation, but that's only semantics. Can anyone look to see where I've erred? Thank you, Koni   -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.