Mailing List error

Just installed this plugin (ZOHO Campaigns) and activated it. Entered my ZOHO account email and API key. It was accepted and I clicked on button to “Proceed”. Keep getting Javascript dialog box stating “No mailing list found. Please add mailing list in your Zoho Campaigns account before proceeding with sign-up form”. Going back to API Settings, it shows my user status as ‘Active’ and integrated on ‘7/3/2018’