Product: ImportOmatic Connector for MailChimp
Description: Occurs when selecting configuration within IOM
                      Occurs when an older version of MailChimp IOM connector is installed
Version: IOM: 3.2.3 / IOM connector for MailChimp: All versions below 2.2.0.2.4
Environment: All

Answer:

Install the latest version of the IOM Connector for Mailchimp.

Please use the following link to locate the ImportOmatic User Guide for additional information.