Hello world "play back"

hi all,

i am new to use this and still struggle with the hello world and encounter a playback problem after the call is successfully established.
this is my edit file:

[from-internal]
exten = 100,1,Answer()

exten = 100,2,Wait(1)

exten = 100,3,Playback(hello-world)

exten =>100,4,Hangup()

and this is cli:
Using SIP RTP CoS mark 5’ (type ‘core show help == Using’ for other possible commands)
localhostCLI> – Executing [100@from-internal:1] Answer(“SIP/6001-00000000”, “”) in new stack
[Jan localhost
CLI> 1 > 0x7fdd7c0056f0 – Probation passed - setting RTP source address to 192.168.164.13:31006
localhostCLI> – Executing [100@from-internal:2] Wait(“SIP/6001-00000000”, “1”) in new stack
localhost
CLI> [Jan 13 19:30:11] WARNING[60205][C-00000000]: pbx.c:4910 pbx_extension_helper: No application ‘Playback’ for extension (from-internal, 100, 3)

want to know what is the problem with no application ‘playback’?

thx

You didn’t include app_playback when you built Asterisk.

yeah…it is solved…

many thx :smiley: