Ubuntu script - Tons of "command not found" errors.

[Skyridr]

So upon attempting to install this on a hetzner dedicated server (using NVME disks), I got a lot of errors:

bash: chroot_execute: command not found
bash: chroot_execute: command not found mountpoint=legacy $v_rpool_name/var/log"

bash: chroot_execute: command not found mountpoint=legacy $v_rpool_name/var/log"
root@rescue / # chroot_execute "echo $v_rpool_name/var/log /var/log zfs nodev,relatime 0 0 >> /etc/fstab"
bash: chroot_execute: command not found
root@rescue / # chroot_execute "zfs set mountpoint=legacy $v_rpool_name/var/spool"
bash: chroot_execute: command not found
root@rescue / # chroot_execute "echo $v_rpool_name/var/spool /var/spool zfs nodev,relatime 0 0 >> /etc/fstab"
bash: chroot_execute: command not found "
bash: chroot_execute: command not found mountpoint=legacy $v_rpool_name/var/tmp"
root@rescue / # chroot_execute "echo $v_rpool_name/var/tmp /var/tmp zfs nodev,relatime 0 0 >> /etc/fstab"
bash: chroot_execute: command not found
root@rescue / # chroot_execute "zfs set mountpoint=legacy $v_rpool_name/tmp"
bash: chroot_execute: command not found
root@rescue / # chroot_execute "echo $v_rpool_name/tmp /tmp zfs nodev,relatime 0 0 >> /etc/fstab"
bash: chroot_execute: command not found

Is there any specific reason why it does this? After like 1 minute of running the script, it goes to the end and reboots the system without actually finishing it.