Cant start conference

I am new to *, and please point out my misstake if I went wrong
I am running on Asterisk 1.2.1, CentOS4.2 Kernel 2.6.9-22.0.1EL
Hardware = Digium TDM 2Fxo and 2 Fxs channel card
I encounter the problem when I start the meetme application.
i start call 6000 ;6000 is my conference room number
and at the CLI screen it show the below,

– Executing MeetMe(“IAX2/301-9”, “6000|i”) in new
== Parsing ‘/etc/asterisk/meetme.conf’: Found
Oct 8 19:36:30 WARNING[3115]: chan_zap.c:912 zt_open:
Unable to open ‘/dev/zap/pseudo’: No such file or
Oct 8 19:36:30 ERROR[3115]: chan_zap.c:7364 chandup:
Unable to dup channel: No such file or directory
Oct 8 19:36:30 WARNING[3115]: app_meetme.c:458
build_conf: Unable to open pseudo channel - trying
Oct 8 19:36:30 WARNING[3115]: app_meetme.c:461
build_conf: Unable to open pseudo device
– Playing ‘conf-invalid’ (language ‘en’)

Infact I did check on my
and I had fill in the parameters as belowing

Section for Zaptel Devices

KERNEL=“zapctl”, NAME="zap/ctl"
KERNEL=“zaptimer”, NAME="zap/timer"
KERNEL=“zapchannel”, NAME="zap/channel"
KERNEL=“zappseudo”, NAME="zap/psuedo"
KERNEL=“zap[0-9]*”, NAME=“zap/%n”

So where is my mistake?
Any advice?

anythings related to belowing messages
"“make: warning: Clock skew detected. Your build may
be incomplete.”"
the above messages was shown during I make install

Post back the output of lsmod