So I went ahead and put JKSM on my 2ds and basically got the same error. I also checked data management, and DQ VIII did show up. I'll try running it again on my 3ds where I originally started it. I have a screenshot of the root of my 3ds sd card compared with the root of my 2ds sd card above a few posts. Maybe that could highlight the issue. A picture of the error on JKSM is there too.It's unrelated to Luma3DS (or CFW).
Check data management if you're not sure.