Virtualbox problem during boot : "CPU doesn't support long mode"

I tried to run NomadBSD (ver. 130R-20210508) on Virtualbox VM, but didn’t boot.
At boot the vm hangs because it seems the ‘CPU doesn’t support long mode’.
Virtualbox (ver. 6.1.22) run on Fedora 34 host.
I execute other virtual machines with FreeBSD 13 without problems.
Any suggestions?

The error message means that you are trying to run a 64-bit NomadBSD on a 32-bit CPU.