Nikon D5100 Reference Manual page 70

This section lists the indicators and error messages that appear in the viewfinder and
monitor.
[] Warning Icons
A flashing 0 in the monitor or _] in the viewfinder indicates that a warning or error message
can be displayed in the monitor by pressing the ? (ql_) button.
L IICICICICI II! i
_g to minimum aperture 18,
198
_ach non-iX NIKKOR lens.
Lensnot attached _, I ..............
Shutterreleasedisabled. I 'i . ........
14,15
Thisbatterycannot be used__
Ch__l on-approved battery. 206
cameraoffand then on Turn camera off, remove and replace battery, and 2, 15
Battery levelis low.
_mera offand recharge or
Lompte_eoperauon anoturn _ .... ,__ _._T. .... - 213
reptace battery.
170
21
_p te.cted!.. Slide 21
_027 ..............
Use approved card.
_ersists, card may be
_uthorized service
representative.
Th'__elete files or insert 213
__ new memory card.
I__ Insert new memory card.
_ireless signal after 175
_ted for Eye-Fi upload.
_ansmission, turn the
camera offand remove the card.
224