Meetme application problem in Asterisk+Dundi

Hi All, I have installed Astrisk in my RHEL5.3 system by compiling asterisk-1.6.1+dahdi-linux-complete2.1.0+asterisk-addons-1.6.0+asterisk-sounds-1.2.1+libri1.4.10 with Postgressql as ODBC for ARA(Asterisk Realtime Architechure) method.
calls between sip users which was configured in extensipons_table are working fine,and CDR’s are getting stored in cdr table, when calling to conference number where MeetMe was used in the DialPlan, call getting Hangup with out any announcement for entering the pin etc.,
Asterisk log showing the below message.
WARNING[21436]: app_meetme.c:864 build_conf: Unable to open pseudo device

I have not installed any hardware for DAHDI.

Thanks in Advance.