Bitnami is a very different setup than normal setups, I would not recommend the Amazon guide at all.
I think (but I don't have any experience) it's better to use the internal Bitnami client and use their how-to: https://docs.bitnami.com/aws/how-to/generate-install-lets-encrypt-ssl/ However, looking at the error message you're getting, it might already be "too late", as it signals your Apache configuration is already broken somehow.
Also, do you actually need a wildcard certificate? Because using this manual process, you'd need to repeat it every two months. It's better to use an automated approach and if you can't automate the DNS challenge, you might want to use a non-wildcard certificate with the http-01 challenge, which is easier automatable.
Hi Osiris - I think you might be correct on the Broken Apache config - I am pretty sure I have a very simple setup with no changes to the default setting - IS there an easy way to reset Apache or do I need to reinstall it?