This error shows up when the Airtable integration has been disconnected from miniExtensions. Here are the steps to restore the integration:
Go to the admin dashboard (web.miniextensions.com)
Click the button Connect to Airtable
This will bring back the integration between miniExtensions and Airtable.
You will see a list of previously connected bases here. Please ensure to add all of them when reconnecting. In case you forget to include some bases during re-authentication, you can follow this article.