Solved cannot add to 'zroot': no such pool or dataset

I have just installed FreeBSD 13 via the installer using the Root on ZFS option. Now I'm trying to add a nvme drive as cache to the zpool but I get the following error...

Code:
root@server:/home/sysadmin # zpool status
  pool: zroot
 state: ONLINE
config:

        NAME        STATE     READ WRITE CKSUM
        zroot       ONLINE       0     0     0
          mirror-0  ONLINE       0     0     0
            da0p3   ONLINE       0     0     0
            da1p3   ONLINE       0     0     0
          mirror-1  ONLINE       0     0     0
            da2p3   ONLINE       0     0     0
            da3p3   ONLINE       0     0     0

errors: No known data errors
root@server:/home/sysadmin # zfs list
NAME                 USED  AVAIL     REFER  MOUNTPOINT
zroot               1.61G  10.6T       96K  /zroot
zroot/ROOT           932M  10.6T       96K  none
zroot/ROOT/default   932M  10.6T      932M  /
zroot/tmp             96K  10.6T       96K  /tmp
zroot/usr            715M  10.6T       96K  /usr
zroot/usr/home       128K  10.6T      128K  /usr/home
zroot/usr/ports      714M  10.6T      714M  /usr/ports
zroot/usr/src         96K  10.6T       96K  /usr/src
zroot/var            676K  10.6T       96K  /var
zroot/var/audit       96K  10.6T       96K  /var/audit
zroot/var/crash       96K  10.6T       96K  /var/crash
zroot/var/log        196K  10.6T      196K  /var/log
zroot/var/mail        96K  10.6T       96K  /var/mail
zroot/var/tmp         96K  10.6T       96K  /var/tmp

root@server:/home/sysadmin # zpool add zroot cache nvme0ns1
cannot add to 'zroot': no such pool or dataset
 
/var/log/messages shows:

Code:
Nov 23 22:02:27 server ZFS[2954]: vdev problem, zpool=zroot path=/dev/nvme0ns1 type=ereport.fs.zfs.vdev.open_failed
 
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