9.3 Update GRUB issue.

I updated to 9.3 on my headless Freenas system and waited out the reboot. But when the system didn't come back online, I attached a monitor and discovered that there was a grub error, and going into GRUB recovery mode. Apparently normal.mod can't be found?

I'm no GRUB expert, can anyone offer some help on how to get back to rights?