[Asterisk-Users] Error on using queue.

[gc]

I am trying to use * as ACD server for our sip proxy.
I first dial 5555559999 to login 5555555598 as ACD agent it worked fine and then when I dialed 5555555598, I got these messages from * CLI:

    -- Executing Answer("SIP/5555555598-f718", "") in new stack
    -- Executing Ringing("SIP/5555555598-f718", "") in new stack
    -- Executing Wait("SIP/5555555598-f718", "2") in new stack
    -- Executing Queue("SIP/5555555598-f718", "queue1") in new stack
Nov 30 16:54:12 WARNING[7579]: app_queue.c:3078 queue_exec: Unable to join queue 'queue1'
    -- Executing Hangup("SIP/5555555598-f718", "") in new stack
  == Spawn extension (default, 5555555599, 5) exited non-zero on 'SIP/5025155598-f718'

Can anybody tell me what cause this problem?
The followings are my configuration files:

extensions.conf:
[default]
;For incoming call to ring into the queue.
exten=> 5555555599,1,Answer
exten=> 5555555599,2,Ringing
exten=> 5555555599,3,Wait(2)
exten=> 5555555599,4,Queue(queue1)
exten=> 5555555599,5,Hangup
;Agent login
exten => 5555559999,1,AgentCallBackLogin(|${CALLERIDNUM}@default)
;Agent logout
exten => 5555558888,1,AgentCallBackLogin(|1)

exten => 5555555597,1,Dial(SIP/5555555597)
exten => 5555555598,1,Dial(SIP/5555555598)

agents.conf:
[Agent1]
agent => 5555555597,1111,Gary1
agent => 5555555598,1111,Gary2

queues.conf:
[queue1]
musiconhold = default
strategy=ringall
timeout=15
retry=5
wrapuptime=0
maxlen = 0
announce-frequency = 0
announce-holdtime = no
member => Agent1/5555555997
member => Agent1/5555555998

sip.conf:
port=5060
bindaddr=192.168.111.11
context=default
allow=ulaw

[5555555597]
type=friend
username=5555555597
insecure=very
canreinvite=no
context=default
host=192.168.111.2

[5555555598]
type=friend
username=5555555598
insecure=very
canreinvite=no
context=default
host=192.168.111.2








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