[Plugin: MailChimp Widget] Unable to Subscribe with Widget

Greetings:
I’m trying to test out the Mailchimp widget against the mailing list that I have there by way of its subscription field that’s on my page (https://www.velanche.com). Unfortunately, I would get a consistent message: There was a problem processing your submission.

I could use some assistance to narrow down this issue; any help would be appreciated. By the way, the API key submitted was successful.

Thanks,
Velanche

https://www.ads-software.com/extend/plugins/mailchimp-widget/