Looks like whatever you're using to handle payments is trying to send an email, but it's erroring because the email address is invalid. This causes an error to be logged in the Joomla mailer queue, which gets displayed on the next page load and that just happens to be CBs registration page (doesn't matter where you send them, you'll likely see it on any page).
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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krileon
