SendBetterEmail not working - Getting Error

After adding the Template Id or the Template Name, I keep getting the following error when debugging:

An Apex error occurred: SendBetterEmail.InvocableActionException: No Messages were sent. First Error: You're trying to pass in both a plaintext/html body and a template ID. Gotta pick one or the other. Make sure you're not confusing the Text Template resources in Flow, (which you can pass into either the HTMLBody or the plainTextBody) with the templateID, which represents a Salesforce Email Template (either Classic or Lightning).