DB2 Audio extender start fail

[Marverick]

Hi!
I have some trouble about DB2 audio extender .
I executed the dmbstart command by DB2 instance user,then some messages were displayed on my telnet-terminal window.
Their messages are below.
#dmbstart

Permission denied.
system failed (2), rc = 256
#

I use DB2 UDB V8.2 and DB2 Audio Extender V8.1 on AIX V5.3.

Do I have to check any log?What kind of log is that?
Please give me some advice!