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That error may have to do with a corruption of the memory card in your r4i. It can be repaired in one of several ways.
- You can run an update on it (exact update depending upon the exact r4i you have.)
- You can put it in a computer card reader and run a Repair Files operation on it (if the computer detects that it needs such a Repair operation.)
- You can back up the files off the card, then reformat it, then restore (re-copy) the files you backed up off of it, back onto it.
Let me know which one of these you need instructions for.