[SOLVED] [FireMotD] Error: Template folder doesn't exist

You mean the GitHub - mthenw/frontail: 📝 streaming logs to the browser. Sponsored by https://cloudash.dev ?
I don’t know if you can install this on DSM. I think that it requires: Node.js — Run JavaScript Everywhere
If you can install nodejs on DSM, then it should be possible.
otherwise: docker

I don’t have a Synology NAS so I can’t help too much

There’s now an issue for this: