How to rebuild initramfs?

when i do that i get
sudo mkinitcpio -p linux
/usr/bin/mkinitcpio: line 268: /etc/mkinitcpio.d/linux.preset: No such file or directory
==> ERROR: Failed to load preset: `/etc/mkinitcpio.d/linux.preset’

sudo mkinitcpio -p linux56
/usr/bin/mkinitcpio: line 268: /etc/mkinitcpio.d/linux56.preset: No such file or directory
==> ERROR: Failed to load preset: `/etc/mkinitcpio.d/linux56.preset’