Having problems with setting up the MailChimp Integration plugin

Hello.

I am getting the following message in the "Error Log" of the MailChimp Integration plugin:

[CODE:211] [Email:] - This list does not have interest groups enabled

And in the "Webhooks Log" I am getting the following:

Request type not defined.

Can you please help me set this up properly. Thanks in advance.

Carla