Answer for Mailchimp/Newsletter errors

Hello, first please make sure you have the right MailChimp API Key and List ID. Also you can use the following information for testing.

MailChimp API Key: 1e90d18c716d481bd3edec201222df93-us9
MailChimp List ID: cbe369f401

If you still get error, please provide me your site URL. Thanks!