Every errors should be considered as abnormal.
Anyway, you don't need to reinstall, follow this instruction, this will give you an operational system after the boot.
first chroot your system. All the following need to be done as root in your chroot environment:
update the system (new 66 version is here 0.2.5.0-1)
# pacman -Syu
now destroy all your trees
# 66-tree -R boot
# 66-tree -R root
make the same for all tree if you have another one
now remake the boot tree
# 66-tree -n boot
# 66-enable -t boot boot
this is sufficient for booting your machine but we want tty
so create it
# 66-tree -cnE root
# 66-enable tty@ tty1 tty@ tty2
Now exit for your chroot and reboot. You should have an operational system, at least it should boot properly.
Well, it's up to you to add service to suit your need for example for the network and so on.
We have update trees for your root user but you need to do now the same for regular user. You should be able to pass through 66-update for this operation, so as normal user do
% 66-update -d
no errors? so continue
% 66-update
done. Check if all is good as root and normal user:
# 66-intree
% 66-intree
Yes an ISO is planned at the start of February month.