You have selected the root file system to be stored on an encrypted partition. This feature requires a separate /boot partition on which the kernel and initrd can be stored.
Tferneḍ anagraw n yifuyla aẓar ad yettukles deg uḥric yettwawgelhen. Tamahilt-a tesra aḥric yettuɛezlen /boot anida kernel akked initrd zemren ad ttukelsen.