[Trigger] Removing gui leaks

[Gost]

How would i remove the Unit group leak from this trigger

• VCast
  • Events
    • Unit - A unit Begins casting an ability
  • Conditions
    • (Ability being cast) Equal to Vengence
  • Actions
    • Set CasterVengence = (Casting unit)
    • Set L = (Position of CasterVengence)
    • Custom script: set bj_wantDestroyGroup = true
    • Unit Group - Pick every unit in (Units within 700.00 of L matching (((Matching unit) belongs to an enemy of (Owner of CasterVengence)) Equal to True)) and do (Actions)
      • Loop - Actions
        • Unit Group - Add (Picked unit) to GroupV
    • Custom script: call RemoveLocation(udg_L)
    • Set L = (Position of CasterVengence)
    • Special Effect - Create a special effect at L using Abilities\Spells\Human\ThunderClap\ThunderClapCaster.mdl
    • Special Effect - Destroy (Last created special effect)
    • Custom script: call RemoveLocation(udg_L)
    • Set Unit = (Random unit from GroupV)
    • Set L = (Position of Unit)
    • Unit - Move (Casting unit) instantly to L
    • Custom script: call RemoveLocation(udg_L)
    • Set L = (Position of CasterVengence)
    • Special Effect - Create a special effect at L using Abilities\Spells\Human\ThunderClap\ThunderClapCaster.mdl
    • Special Effect - Destroy (Last created special effect)
    • Custom script: call RemoveLocation(udg_L)
    • Unit - Cause CasterVengence to damage Unit, dealing 350.00 damage of attack type Hero and damage type Death
    • Wait 0.25 seconds
    • Custom script: call DestroyGroup(GroupV)
    • Unit Group - Remove all units from GroupV

It says its leakless in leak checker but when i save it (i have jassnewgenpack) jass helper says when i do this

• Custom script: set bj_wantDestroyGroup = true

That GroupV is a undeclared variable, so i guess my quiestion is what should i do to fix it....?
EDIT: Wow im an idiot, the problem was because i had Custom script: call DestroyGroup(GroupV) at the end, it works and is leakless now, this can be closed