I use the form to capture first name, second name and email address and I map to the list in MailChimp
I default to subscribe in my integration properties

But then I get this error when I submit the form:
"You must provide at least one recipient email address."

But I did add an email address - I would get a different validation error if I omit it

Is there something else I need to set? Or have an incorrect setting?
Thanks!

Here is some additional information:

I have a TEST site martry.redbee.ie where you can test it out, see the error half-way down the homepage after submission.
The submitter receives the email confirming they subscribed, asking for confirmation on MailChimp.
The admin gets the email with all the details in it.

So why the message?

In order to resolve this issue please make sure that the To and From fields from the User/Admin or Additional emails section contain valid email addresses or placeholders that return valid email addresses.

More information can be found here:
http://www.rsjoomla.com/support/documentation/view-article/773-rsformpro-you-must-provide-at-least-one-recipient-email-address-error.html