I’ve been getting this error also running the Auth.net payment gateway. I fixed it by going into the Auth.net payment gateway settings and changing the “Payment form type” setting from “Inline” to “Lightbox”.
Lightbox is better anyway since the web site it not taking the credit card info – Auth.net is taking the credit card info directly through a pop-up I-frame Lightbox. Your site is never seeing the credit card info – which makes our site truly PCI compliant.
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This reply was modified 4 years, 6 months ago by Ross Gile. Reason: add one word