Swep error for tank please help. zs

[unclem0]

The error code I'm getting is

[ERROR] gamemodes/zombiesurvival/entities/weapons/weapon_zs_zombie/shared.lua:323: attempt to perform arithmetic on local 'armdelay' (a nil value)
1. SendAttackAnim - gamemodes/zombiesurvival/entities/weapons/weapon_zs_zombie/shared.lua:323
2. StartSwinging - gamemodes/zombiesurvival/entities/weapons/weapon_zs_tank/shared.lua:64
3. PrimaryAttack - gamemodes/zombiesurvival/entities/weapons/weapon_zs_zombie/shared.lua:279
4. unknown - gamemodes/zombiesurvival/entities/weapons/weapon_zs_tank/shared.lua:49

It spams 4 times every time I attempt to use the primary attack.

-----------------------------------------

This is the weapon Lua file.

---
if not gamemode.Get("zombiesurvival") then return end

AddCSLuaFile()

SWEP.Base = "weapon_zs_zombie"

SWEP.MeleeReach = 50
SWEP.MeleeDamage = 40
SWEP.MeleeForceScale = 5
SWEP.MeleeSize = 2.8
SWEP.MeleeDamageType = DMG_SLASH
SWEP.Primary.Delay = 1.5
SWEP.Primary.Automatic = false
SWEP.Secondary.Delay = 5

AccessorFuncDT(SWEP, "AttackAnimTime", "Float", 3)

function SWEP:CheckMoaning()
if self:IsMoaning() and self.Owner:Health() < self:GetMoanHealth() then
self:SetNextSecondaryFire(CurTime() + 1)
self:StopMoaning()
end
end

function SWEP:Think()
self:CheckMeleeAttack()
--self:CheckMoaning()
end

function SWEP:ApplyMeleeDamage(ent, trace, damage)
if ent:IsValid() and ent:IsPlayer() then
local vel = ent:GetPos() - self.Owner:GetPos()
vel.z = 0
vel:Normalize()
vel = vel * 400
vel.z = 200

ent:KnockDown()
ent:SetGroundEntity(NULL)
ent:SetVelocity(vel)
end

self.BaseClass.ApplyMeleeDamage(self, ent, trace, damage)
end

function SWEP:PrimaryAttack()
if not self.Owner:OnGround() then return end

self.BaseClass.PrimaryAttack(self)

if self:IsSwinging() then
self:SetAttackAnimTime(CurTime() + self.Primary.Delay)
end
end

function SWEP:SecondaryAttack()
self.BaseClass.SecondaryAttack(self)
end

function SWEP:StartSwinging()
if self.MeleeAnimationDelay then
self.NextAttackAnim = CurTime() + self.MeleeAnimationDelay
else
self:SendAttackAnim()
end

local owner = self.Owner
owner:DoAttackEvent()

if SERVER then
self:PlayAttackSound()
end
--self:StopMoaning()

if self.FrozenWhileSwinging then
owner:SetSpeed(1)
end

if self.MeleeDelay > 0 then
self:SetSwingEndTime(CurTime() + self.MeleeDelay)

local trace = self.Owner:MeleeTrace(self.MeleeReach, self.MeleeSize, player.GetAll())
if trace.HitNonWorld then
trace.IsPreHit = true
self.PreHit = trace
end

self.IdleAnimation = CurTime() + self:SequenceDuration()
else
self:Swung()
end
end

function SWEP:StopMoaning()
if not self:IsMoaning() then return end
self:SetMoaning(false)
self.Owner:ResetSpeed()
end

function SWEP:StartMoaning()
--if not self.Owner.m_Boss_Moan then return end
if self:IsMoaning() then return end
self:SetMoaning(true)

self.Owner:SetWalkSpeed( self.Owner:GetMaxSpeed() * 1.8 )

self:SetMoanHealth(self.Owner:Health())
end

function SWEP:IsInAttackAnim()
return self:GetAttackAnimTime() > 0 and CurTime() < self:GetAttackAnimTime()
end

function SWEP:OnRemove()
if IsValid(self.Owner) then
self:StopMoaning()
end
end
SWEP.Holster = SWEP.OnRemove

function SWEP:PlayAlertSound()
self.Owner:EmitSound("tank/voice/yell/tank_yell_0"..math.random(1, 9)..".wav", 77, 45)
end

function SWEP:PlayIdleSound()
self.Owner:EmitSound("tank/voice/idle/tank_voice_0"..math.random(1, 9)..".wav", 77, 60)
end

function SWEP:PlayAttackSound()
self.Owner:EmitSound("tank/voice/attack/tank_attack_0"..math.random(1, 9)..".wav")
end

function SWEP:PlayHitSound()
self.Owner:EmitSound("physics/body/body_medium_impact_hard"..math.random(6)..".wav", 77, math.random(60, 70))
end

function SWEP:PlayMissSound()
self.Owner:EmitSound("npc/zombie/claw_miss"..math.random(2)..".wav", 77, math.random(60, 70))

end

function SWEP:SetMoaning(moaning)
self:SetDTBool(0, moaning)
end

function SWEP:GetMoaning()
return self:GetDTBool(0)
end
SWEP.IsMoaning = SWEP.GetMoaning

function SWEP:SetMoanHealth(health)
self:SetDTInt(0, health)
end

function SWEP:GetMoanHealth()
return self:GetDTInt(0)
end