Canon S400 Reference Manual page 216

Other error messages
Check 3
Error number (xxxx:) displayed?
Macintosh
Error number (*202)
Sufficient memory not available for the application program.
Make sure the required amount of memory is allocated to the application
program. If there is not enough memory installed, install more memory.
Refer to the user's manual for your computer for information on installing
additional memory.
Error number (*203)
Installed printer driver not operating correctly.
Remove the installed BJ printer driver and then install the printer driver
again. For details, refer to the Driver and Utility Guide for Macintosh Users.
Troubleshooting - An Error Message Appears 216