Canon 1100 Reference Manual page 169

There is no loaded paper with the same size as the slide guide width. Adjust the slide guide
width and reset the paper size.
Cause : The paper size specified through the touch panel display is different from the width
of the slide guides on the stack bypass.
Remedy : Adjust the slide guides to match the size of the paper loaded in the stack bypass.
This number has not been stored. Enter the number again.
Cause : The number entered is incorrect.
Remedy : Enter the correct number, or contact the supervisor of the copier.
This size cannot be stapled.
Cause : The specified paper size cannot be stapled.
Remedy : The paper sizes that can be stapled are A3, A4, and A4R. (See 'Staple-sort
Function', on p. 5-40.)
This staple position is not possible.
Cause : The selected paper size cannot be stapled in the designated position.
Remedy : Reselect a different paper size, or change to the appropriate staple position for the
selected paper size. For information on the available staple positions for each paper
size, refer to 'Staple-sort Function' (see p. 5-40).
Touch Panel Display Messages
4
4-35