If the current folder is numbered 999 and contains 200 images, or an image is numbered

9999, no further images can be captured until the internal memory or memory card is formatted (E72), or a new memory card is inserted.

Reference Section

E84

Page 202
Image 202
Nikon 6MN14111-02, L820 Black, L820 Red, COOLPIXL820BLK, CT2L02(11) manual E84