Can you boot into stock firmware? If you can, I'd just start over by following the NH Switch guide. I'm not really sure what else may be the cause of the error you're getting. It's usually outdated Atmosphere/Hakate or payloads. Maybe even some files aren't in the correct locations or maybe it's a faulty SD card. If you can boot into stock firmware, that would be the best case scenario, meaning that you can start from scratch and you shouldn't run into any issue if you follow all of the steps in that guide.I tried this and it still didn’t work
For game backups to work, you'll need latest sys-patch (for firmware 19.0.0 or newer and Atmosphere 1.8.0 or newer).
If you plan on connecting your emuNAND to the Internet, make sure to setup 90DNS or DNS MITM in order to block Nintendo servers.
For keeping your CFW up-to-date, check this guide afterwards.
If you don't want to start anew, maybe wait for someone else to reply back and possibly find a solution to your problem.