FORM SUBMISSION ERROR

Upon submission in the Hustle form, I get the following error - "Something went wrong, please try again."

However I am just testing it to CSV. All the emails I have entered are appearing in the plugin 'View email list' but the widget itself gives the wrong user experience.

I also tried adding the service to MailChimp and that did not work. I have both a slider and a coded version of the same sign-up tool an both are acting the same way.