Exit error: Cannot declare class Parsedown, because the name is already in use

I've just set up my Aiomatic plugin and getting the following error after trying to run my Bulk AI posting. Exit error: Cannot declare class Parsedown, because the name is already in use, file: /public_html/wp-content/plugins/aiomatic-automatic-ai-content-writer/res/Parsedown.php, line: 16 - rule ID: 0! I have 3 licenses and on my other two sites that I'm running this plugin, I don't get this error.