TypeError: Cannot read property 'msg' of undefined

[dharry1968]

I am getting this error after a about 1 minute after pressing the Subscribe button, I notice on your demo that it also just sits there saying "Sending..." as well, which is what mine does before the error.

Have Mailchimp changed something or am I doing something wrong?

Unhandled Runtime Error
TypeError: Cannot read property 'msg' of undefined

Call Stack

node_modules\react-mailchimp-form\dist\index.js (133:0)

Any help would be awesome :)