Canon 850 IS - Manual (Page 120)

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Naming error!
The file name could not be created because there is a file with
the same name as the folder that the camera is attempting to
create, or the highest possible file number has already been
reached. In the Set up menu, set the File Numbering option to
[Auto Reset]; alternatively, save all the images you wish to retain
onto a computer, then reformat the memory card. Please note
that formatting will erase all the existing images and other data.
Change the battery pack.
Battery charge is insufficient to operate the camera. Replace it at
once with a charged one or recharge the battery.
No image.
No images recorded on memory card.
Image too large.
You attempted to play back an image larger than 4992 x 3328
pixels or with a large data size.
Incompatible JPEG format.
You attempted to play back an incompatible JPEG image (such
as those edited on computers).
RAW
You attempted to play back a RAW image.
Unidentified Image
You attempted to play back a corrupted image, an incompatible
image (proprietary format used by another manufacturer’s
camera, etc.), an image edited on a computer or a movie clip
recorded by another camera.
Cannot magnify!
You attempted to magnify an image recorded in a different
camera or data type, an image edited with a computer, or a
movie.