Mailchimp connection is not working at all, please fix.
We recently updated the MailChimp connector and that changed how some metric and dimensions behaved. While it should be generally backwards compatible, there are some cases where things that worked in the prior version do not work now and you have to change your queries.
First, please make sure you have the latest version of the connector by doing the following for the MailChimp data source:
If the error persists after refreshing the connector, check you queries settings as they may no longer be permitted in that configuration. If you need additional assistance, please provide the query settings for item getting this error and we can check into it.