Callback not generated please help

Hi,

I m getting problem with callback feature. i have configure callback and rout the call on callback from inbound DID, when i try to make a call call is land on callback section and my call is disconnect, according to callback feature i have set Delay Before Callback : 3 sec. but system is not give me call. when i try to run “/var/lib/asterisk/bin/callback 900971559266627 ivr-3.s.1 3 &” on command prompt i get the call but using freepbx i didn’t get call. I think asterisk is not able to run System command, then help me how to fixed…

Please help me, following is asterisk log.

– Executing [[email protected]:1] Set(“SIP/213.40.29.7-c80018a0”, “CALL=900441282777711”) in new stack
– Executing [[email protected]:2] Set(“SIP/213.40.29.7-c80018a0”, “DESTINATION=ivr-3.s.1”) in new stack
– Executing [[email protected]:3] Set(“SIP/213.40.29.7-c80018a0”, “SLEEP=3”) in new stack
– Executing [[email protected]:4] System(“SIP/213.40.29.7-c80018a0”, “/var/lib/asterisk/bin/callback 900971559266627 ivr-3.s.1 3 &”) in new stack
– Executing [[email protected]:5] Hangup(“SIP/213.40.29.7-c80018a0”, “”) in new stack
== Spawn extension (callback, 5, 5) exited non-zero on 'SIP/213.40.29.7-c80018a0’
host2*CLI>

Thanks