Canon 970 IS - Manual (Page 206)

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Unselectable image
You attempted to set the print settings for a non-JPEG image.
Cannot select
In selecting the image range for categorizing via the My Category
function, protecting images, erasing images or specifying print
settings, you selected a starting image with a file number higher
than the last image or a last image with a file number lower than the
starting image. Or, you specified more than 500 images.
Communication error
The computer was unable to download the image due to the large
amount of images (approx. 1000) stored on the memory card. Use a
USB card reader or a PCMCIA card adapter to download the
images.
Lens error, restart camera
An error was detected while the lens was in motion, and the power
has been automatically turned off. This error can occur if you hold
the lens while it is in motion or you operate it in a location with
excessive dust or sand in the air. Try turning the power back on, and
resume shooting or playback. If this message continues to display,
contact your Canon Customer Support Help Desk as there may be a
problem with the lens.
Exx
(xx: number) Camera detected an error. Turn the power off and then
back on, then shoot or play back. A problem exists if the error code
reappears. Note the number and contact your Canon Customer
Support Help Desk. If an error code displays directly after taking a
picture, the shot may not have been recorded. Check image in
playback mode.