Make sure that you have a "Nintendo 3DS" folder. Make sure that "/Nintendo 3DS/(id0)/(id1)/dbs/" import.db and title.db exist.It still isn't working.
If not, go into Data Management and it should try to "fix" them. Or, if they do exist, try deleting them and then go into Data Management.
Afterwards, try FBI again.
If all this fails, you most likely have a bad SD card.
For reference:
https://github.com/Steveice10/FBI/issues/211
https://github.com/Steveice10/FBI/issues/222







