Bukkit

in the config the change sound is not working. Even the NONE is not working I am trying to use the fireworks.launch sound. it also says this hen i start up the server ERROR]: [DoubleJump] §4Couldn't find your named sound! Restored default value!  I assume this means that i am not using the correct format for putting in the sounds.

if you could point me in the right direction that would be great

Thanks (config below)

enabled: true
auto-update: true
falldamage: false
damagemultiplier: 1
allowinliquids: true
togglecooldown: 0
mode: COOLDOWN
cooldown: 0
usexpbar: true
bypassanticheat: false
bypassnocheatplus: false
maxcheckexemptiontime: 0
item:
  id: 280
  displayname: '&6Doublejump'
  onjoin: true
  locked: true
  slotid: 9
worlds:
- world
- world_nether
- world_the_end
flycommands:
- /fly
boost:
  forwardmultiplier:
  upwards: 1.5
  effect: SMOKE
  sound: fireworks.launch