xedamage exception not working for this code only?

scope Blaze initializer init

globals
    private constant integer spell = 'A00Q'
    private group g = CreateGroup()
    private constant string sfx = "Abilities\\Spells\\Other\\Doom\\DoomDeath.mdl"
endglobals

private struct data
    unit c
    real dmg
    real dur
    real x
    real y
endstruct

private function callBack takes nothing returns boolean
    local timer t = GetExpiredTimer()
    local data d = GetTimerData(t)
    local real nx = GetUnitX(d.c)
    local real ny = GetUnitY(d.c)
    local real dis = SquareRoot((nx-d.x)*(nx-d.x) + (ny-d.y)*(ny-d.y))
    local xedamage xe = xedamage.create()
    set xe.dtype = DTFIRE
    set xe.exception = UNIT_TYPE_STRUCTURE
    set xe.exception = UNIT_TYPE_MAGIC_IMMUNE
    if dis >= 100 then
        call xe.damageAOE(d.c,d.x,d.y,250.0,d.dmg)
        call DestroyEffect(AddSpecialEffect(sfx,d.x,d.y))
        set d.x = nx
        set d.y = ny
    endif
    set d.dur = d.dur - 0.035
    if d.dur <= 0.0 then
        call ReleaseTimer(t)
        call d.destroy()
    endif
    call xe.destroy()
    set t = null
    return true
endfunction

private function act takes nothing returns nothing
    local data d = data.create()
    local timer t = NewTimer()
    local unit c = SpellEvent.CastingUnit
    local integer l = GetUnitAbilityLevel(c,spell)
    set d.c = c
    set d.dmg = 40*l
    set d.dur = 15.0
    set d.x = GetUnitX(c)
    set d.y = GetUnitY(c)
    call TimerStart(t,0.035,true,function callBack)
    call SetTimerData(t,d)
    set t = null
    set c = null
endfunction

private function init takes nothing returns nothing
    call RegisterSpellEffectResponse(spell,act)
endfunction

endscope