You have selected the /boot file system to be stored on an encrypted partition. This is not possible because the boot loader would be unable to load the kernel and initrd. Continuing now would result in an installation that cannot be used.
Tferneḍ anagraw n yifuyla /boot i wakken ara tkelseḍ deg uḥric yettwawgelhen. D awezɣi waya acku asalay n usenker ur yettizmir ara ad d-isali kernel akked initrd. Akemmel tura ad d-yeglu s usebded ur nettuseqdac ara.