Nikon D6 Reference Manual page 1070

Monitor
This card is not
formatted.
Format the
card.
Unable to start
live view. Please
wait.
Folder contains
no images.
All images are
hidden.
1018 Alerts and Error Messages
Alert
Top
control
panel
T
(flashes)
—
—
—
Problem/solution
Memory card is not correctly formatted.
•
Format memory card.
•
Replace with correctly-formatted memory
card.
Camera's internal temperature is
elevated.
Suspend shooting until camera has cooled.
Folder contains no pictures.
Insert memory card that contains pictures.
No pictures in folder selected for
playback.
Use [Playback folder] item in playback
menu to select folder that contains pictures.
All pictures in current folder are hidden.
Use [Hide image] item in playback menu to
reveal pictures.