newbie - a400p "dahdi show channls" command not found

Hi,
I followed the installation manual as in http://www.openvox.com.cn/downloadsFile/A400P-A400E-User-Manual.pdf
But when I run "dahdi show channels", I get the following errors:

No such command "dahdi show channels" .....

My config:
- a400p with 1 fxo module.
- trixbox 2.8

Any idea what is wrong?

Here are outputs of some other commands:

[trixdb asterisk]# asterisk -r
Asterisk 1.6.0.10-FONCORE-r40, Copyright (C) 1999 - 2008 Digium, Inc. and others.
Created by Mark Spencer <This email address is being protected from spambots. You need JavaScript enabled to view it.>
Asterisk comes with ABSOLUTELY NO WARRANTY; type 'core show warranty' for details.
This is free software, with components licensed under the GNU General Public
License version 2 and other licenses; you are welcome to redistribute it under
certain conditions. Type 'core show license' for details.
=========================================================================
Connected to Asterisk 1.6.0.10-FONCORE-r40 currently running on trixdb (pid = 4135)
Verbosity is at least 3
trixdb*CLI> dahdi show channels
No such command 'dahdi show channels' (type 'help dahdi show' for other possible commands)
trixdb*CLI>




[trixdb dahdi]# lsdahdi
### Span 1: WCTDM/4 "Wildcard TDM400P REV E/F Board 5" (MASTER)
1 FXO FXSKS (In use) (SWEC: MG2)
2 EMPTY
3 EMPTY
4 EMPTY
[trixdb dahdi]#

[trixdb sbin]# ./dahdi_scan
[1]
active=yes
alarms=OK
description=Wildcard TDM400P REV E/F Board 5
name=WCTDM/4
manufacturer=Digium
devicetype=Wildcard TDM400P REV E/F
location=PCI Bus 00 Slot 16
basechan=1
totchans=4
irq=201
type=analog
port=1,FXO
port=2,none
port=3,none
port=4,none
[trixdb sbin]#

Thanks in advance.

Hello,
Please have a try with this method:
1.Unload asterisk with "stop now" on the CLI console.
2.Unload driver dahdi with "service dahdi stop", then load it again with these commands:
A: modprobe dahdi.
B: modprobe wctdm opermode=Your country debug=1
C. dahdi_genconf
D: dahdi_cfg -vvvvv
3.Then,please the check the files /etc/dahdi/system.conf , /etc/asterisk/chan_dahdi.conf and /etc/asterisk/dahdi-channels.conf.Make sure all the parameters are set to be the right status.
4. Start asterisk with asterisk -vvvvvvgc
5. On the CLI console, run the command dahdi show channels.