JM_BAD_REQUEST (Your merge fields were invalid.)

Hi Support,

I get the above mentioned error upon signup. I am doing tests on localhost (assuming this is supported). In my mailchimp, I have First Name, Last Name and Email all as required fields, but when I try to configure the module, I see Birthdate (which I have no idea where it's coming from) and Email.

I only wish to use Email, but when I do, the error appears. Can you advise ?

Regards,

(Super extension btw, keep up the good work)