Discourse Automation Plugin failing with an 'internal server error'

Thank you for your patience!

I’m getting another generic issue {"status":422,"error":"Unprocessable Entity"}. Please see screenshot after I click on ‘approve’:

The payload is form data (application/x-www-form-urlencoded; charset=UTF-8):
user_id=10127&accept=true

Thanks! Though I’m not sure why it’s saying ‘unprocessable entity’, any tip?