Canon PowerShot A550 User Manual page 128

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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.
(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.