Payment Type ONLINE_CREDIT_CARD_PROCESSOR is not a valid option

I get the following error when using the Constant Contact Event Widget:
“Payment Type ONLINE_CREDIT_CARD_PROCESSOR is not a valid option”

This happens in two places:

This happens when one of the events in the list has credit card as a payment option. It bombs out the entire events list and just shows the message.

The error also comes up when viewing an individual event detail from : …/wp-admin/admin.php?page=constant-contact-events&view=a07e97kyazmc8b269df

The admin list shows fine, but clicking on an event with credit card payment option, it throws up that message.

https://www.ads-software.com/plugins/constant-contact-api/