Call Flow Toggle does not play sound

When using the Call Flow Toggle (*280 in this case); the toggle is correctly set and BLF is updated, but there is no filename specified to play back to the user. This is captured in the CLI output below.
I also confirmed under advanced settings that “Feature Code Beep Only” was set to FALSE.

– Executing [*[email protected]:1] Answer(“SIP/221-00000021”, “”) in new stack
– Executing [*[email protected]:2] Wait(“SIP/221-00000021”, “1”) in new stack
– Executing [*[email protected]:3] Set(“SIP/221-00000021”, “INDEX=0”) in new stack
– Executing [*[email protected]:4] Set(“SIP/221-00000021”, “DAYREC=”) in new stack
– Executing [*[email protected]:5] Set(“SIP/221-00000021”, “NIGHTREC=”) in new stack
– Executing [*[email protected]:6] Goto(“SIP/221-00000021”, “app-daynight-toggle,s,1”) in new stack
– Goto (app-daynight-toggle,s,1)
– Executing [[email protected]:1] Set(“SIP/221-00000021”, “DAYNIGHTMODE=DAY”) in new stack
– Executing [[email protected]:2] GotoIf(“SIP/221-00000021”, “0?day:night”) in new stack
– Goto (app-daynight-toggle,s,7)
– Executing [[email protected]:7] Set(“SIP/221-00000021”, “DB(DAYNIGHT/C0)=NIGHT”) in new stack
– Executing [[email protected]:8] Set(“SIP/221-00000021”, “DEVICE_STATE(Custom:DAYNIGHT0)=INUSE”) in new stack
– Executing [[email protected]:9] Playback(“SIP/221-00000021”, “”) in new stack
[2011-04-26 13:40:05] WARNING[13910]: app_playback.c:433 playback_exec: Playback requires an argument (filename)
== Spawn extension (app-daynight-toggle, s, 9) exited non-zero on ‘SIP/221-00000021’
== Extension Changed *280[app-daynight-toggle] new state InUse for Notify User 221