Help plz [Unable to open master device /dev/zap/ctl ]

i have asterisk 1.4.6, kernal 2.6, zaptel 1.4.7 and libpri 1.4.2
and also have two x100p card with one fxo card each.
i plugged them in to pci slots and both of them are detected by system
i have some problems in zaptel

after installation of
libpri,zaptel and asterisk
when i give the following commands : it gives error as shown below.

[code]bash-3.1# /sbin/ztcfg
Notice: Configuration file is /etc/zaptel.conf
line 0: Unable to open master device ‘/dev/zap/ctl’

1 error(s) detected

bash-3.1# /sbin/ztcfg -vv
Notice: Configuration file is /etc/zaptel.conf
line 0: Unable to open master device ‘/dev/zap/ctl’

1 error(s) detected

bash-3.1# /sbin/zttool
Unable to open /dev/zap/ctl: No such file or directory
bash-3.1#
[/code]

i manually go there to check
there is no zap directory in /dev directory
whats wrong there…
kindly help me i am struggling for last one month on this problem…

bundle of thanks and regards in advance.[/code]