I just press Yes when this message appear and everything went just fine.
Press Yes, to erase the entire ECU flash memory and restart the flashing process.
Press No, to skip flashing this sector and continue the flashing process.
Press Cancel, to abort the flashing process.
WARNING: Only erase the entire flash memory if you have a good communication connection with the ECU. If flashing fails after erasing the entire flash memory, it is likely the ECU will no longer boot, and will have to be reflashed on the bench using boot mode. This software does NOT support boot mode. Result: CANCEL