Members Can't Register with MailChimp

Experienced another error with the new Membership update.

Attempting to register Member and it fails to display the next page as the following error displays:

Fatal error: Class 'M2_Mailchimp' not found in /home/thegocoach/public_html/wp-content/plugins/membership/app/addon/mailchimp/class-ms-addon-mailchimp.php on line 293

Turned off the add-on and turned it back on but still no change.

I turned off the add-on and new members can register now. However our list will be out of sync.