Community Builder Field Error

When I save a field that I'm trying to link to Mailchimp, I get the following error:

An error has occurred.
0 Call to undefined method joomailermailchimpintegrationModelFields::getListMergeFields()

Using Joomlamailer 3..0.3 (installed today - Set up API key and created the Newsletter field as shown in help)
Using Community Builder 2.4.1
Using Joomla 3.9.4

I also want to link the Joomla core UserID to a matching field in Mailchimp, but I'm not sure how that would be done.

Thank you,
Ernie