Canon EOS rebel xs - Manual (Page 175)

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If there is a problem with the camera, an
error message appears. Follow the on-
screen instructions.
To recover from the error screen, turn the
power switch off and on, or remove and
reinstall the battery.
If error 02 (Card problem) is displayed,
remove and reinstall the card or format
the card. This may resolve the problem.
If the same error keeps occurring, there may be a problem. Write
down the error code and consult your nearest Canon Service
Center.
Error Codes
Error code
Countermeasures
If an error code appears right after shooting, the picture might not have been
captured. After the error is resolved, press the button and check if the
picture was captured.