Canon POWERSHOT G9 User Manual page 223

List of Messages
1221
The file name could not be created because there is an image with
the same name as the folder that the camera is attempting to create,
or the highest possible file number has already been reached, tn the
Set up menu, set [File Numbering] 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.
Battery charge is insufficient to operate the camera. Replace it at
once with a charged one or recharge the battery.
No images recorded on memory card.
You attempted to play back an image larger than 5616 x 3744 pixels
or with a large data size.
You attempted to play back an incompatible JPEG image (an image
that has been downloaded to a computer and altered., etc.).
You attempted to play back a different type of RAW 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.
You attempted to magnify an image recorded in a different camera
or data type, an image edited with a computer, or a movie.
You attempted to rotate an image recorded in a different camera or
data type, an image edited with a computer.