Do you use QuickBooks yet encounter issues with error 1603? The QuickBooks error 1603 is not a system-wide problem, and no user action is required to fix it, so you should be aware of that. Despite being harmless, this error may be very confusing to those who are not graphically inclined. The error that occurs and flashes a warning message as an alert in the corner of the screen indicates that there was a problem saving your file before terminating the software. You will have to start the process over from scratch whether you select "Cancel" or "Don't Save," though.