bhyve question about vm-bhyve create zvol vm in freebsd15 ?

dear all:
i have create a freebsd15 server with 2 zpools (system2026 for freebsd system, vmdata for vm-bhyve vm ). below was the configure ..
Code:
Script started on Fri Apr 10 11:36:36 2026
root@yjjy002:~ # zpool lis
zpool list
NAME         SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
system2026   764G  6.54G   757G        -         -     0%     0%  1.00x    ONLINE  -
vmdata      7.27T  3.84G  7.26T        -         -     0%     0%  1.00x    ONLINE  -

#zpool status
  pool: system2026
 state: ONLINE
config:

    NAME        STATE     READ WRITE CKSUM
    system2026  ONLINE       0     0     0
      mirror-0  ONLINE       0     0     0
        da0p3   ONLINE       0     0     0
        da1p3   ONLINE       0     0     0

errors: No known data errors

  pool: vmdata
 state: ONLINE
config:

    NAME        STATE     READ WRITE CKSUM
    vmdata      ONLINE       0     0     0
      mirror-0  ONLINE       0     0     0
        da2     ONLINE       0     0     0
        da3     ONLINE       0     0     0

errors: No known data errors
root@yjjy002:~ # zfs list
NAME                      USED  AVAIL  REFER  MOUNTPOINT
system2026               6.54G   734G    96K  /system2026
system2026/ROOT          6.54G   734G    96K  none
system2026/ROOT/default  6.54G   734G  6.54G  /
system2026/home            96K   734G    96K  /home
system2026/tmp            104K   734G   104K  /tmp
system2026/usr            288K   734G    96K  /usr
system2026/usr/ports       96K   734G    96K  /usr/ports
system2026/usr/src         96K   734G    96K  /usr/src
system2026/var            788K   734G    96K  /var
system2026/var/audit       96K   734G    96K  /var/audit
system2026/var/crash       96K   734G    96K  /var/crash
system2026/var/log        300K   734G   300K  /var/log
system2026/var/mail       104K   734G   104K  /var/mail
system2026/var/tmp         96K   734G    96K  /var/tmp
vmdata                   3.84G  7.14T    96K  /vmdata
vmdata/vm                3.84G  7.14T   248K  /vmdata/vm
vmdata/vm/fb15            238M  7.14T   120K  /vmdata/vm/fb15
vmdata/vm/fb15/disk0      237M  7.14T   236M  -
vmdata/vm/fb16           1.30M  7.14T   112K  /vmdata/vm/fb16
vmdata/vm/fb16/disk0     1.23M  7.14T   236M  -
vmdata/vm/hlw001         1.80G  7.14T  1.80G  /vmdata/vm/hlw001
vmdata/vm/hlw002         11.2M  7.14T  1.79G  /vmdata/vm/hlw002
vmdata/vm/hlw003         1.79G  7.14T  1.79G  /vmdata/vm/hlw003

root@yjjy002:~ # cat /etc/rc.conf
hostname="yjjy002.laifeng.xian"
ifconfig_igb0="inet 10.8.1.253 netmask 255.255.255.0"
defaultrouter="10.8.1.254"
sshd_enable="YES"
moused_nondefault_enable="NO"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="AUTO"
zfs_enable="YES"
vm_enable="yes"
vm_dir="zfs:vmdata/vm"

root@yjjy002:~ # vm switch list
NAME    TYPE      IFACE      ADDRESS  PRIVATE  MTU  VLAN  PORTS
public  standard  vm-public  -        no       -    -     igb0

root@yjjy002:~ # vm list
NAME    DATASTORE  LOADER     CPU  MEMORY  VNC              AUTO  STATE
fb15    default    bhyveload  1    2gb     -                No    Stopped
fb16    default    bhyveload  1    2gb     -                No    Stopped
hlw001  default    uefi       8    32gb    10.8.1.253:5900  No    Running (6308)
hlw002  default    uefi       8    32gb    10.8.1.253:5901  No    Running (6854)
hlw003  default    uefi       8    16gb    10.8.1.253:5902  No    Running (7246)
root@yjjy002:~ # exit
question was in below picture ...when i used command : # vm create -t freebsd-zvol -m 2gb -s 20gb freebsd15 . ..got a error message in the picture. please help me. thanks.....
 

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