EZJail Start - mount_nullfs: Operation not supported by device

[ESPNSTI]

Hi,

I'm attempting to create a jail using EZJail on my pfSense 2.1.5 i386 box that is running on a Soekris net6501-50.
I have tested this (using the same pfSense version) on a Virtual machine and don't encounter any problems there.
However if I try it on the Soekris, I get a "mount_nullfs: Operation not supported by device" error.

These are the exact steps I am using:

setenv PACKAGESITE ftp://ftp.freebsd.org/pub/FreeBSD/ports/i386/packages-8-stable/Latest/

pkg_add -r ezjail

ezjail-admin install -r "8.4-RELEASE" -h ftp.freebsd.org

In pfsense, I add a Carp Virtual IP, LAN 10.x.x.50/24

ezjail-admin create -r /jails/myjail myjail 10.x.x.50

Once I try to start it however, I get this error:

: service ezjail onestart
 ezjailConfiguring jails:.
Starting jails:mount_nullfs: Operation not supported by device
 cannot start jail "myjail":
jail: execvp: /bin/sh: No such file or directory

I don't know why it works on the VM, but not on the Soekris.
Any ideas?

Thanks,
    Erik