I looked up the error code, and it seems like this usually happens if you have Home open on another device, like the mobile version. If you've got it installed on any other devices, make sure it's closed.
This is a fix- what you do is create another user, go into pokemon home on that user, click on view another user's save data, click on the one you are having problems with, and then click on what game you want. Immeadiatly after press + and save changes and exit, and then go back in and it should work. I had this glitch and this worked for me.
I looked up the error code, and it seems like this usually happens if you have Home open on another device, like the mobile version. If you've got it installed on any other devices, make sure it's closed.
If that's not it, this GameFAQs page has another suggestion.
Hopefully one of these can fix it for you!