I keep getting an error about extra data being unable to be created. How do I fix this?

So what happened was that I was trying to delete save data from the EU/AUS version because I had it for my brother to use, but since I'm moving out, I wanted to wipe that data out. I also wanted to edit the save data and stuff to unlock certain things, but I mistakenly deleted the "extra data" for my copy of Tomodachi Life, and now I can't get that stuff to work. Basically, I can't use SpotPass or StreetPass anymore. :(

I tried uninstalling and reinstalling the game so it can go ahead and create said extra data, but it gives me the error that my SD card isn't being detected or something... even though the game is downloaded on it...

Does anyone have any clue on how to fix this?