[LUA] Lua Help

[Lapito]

Hello, I have an entity, and everything works fine, but when I undone this, I get this error.

[Drivable Halo Pelican] lua/entities/pelican/init.lua:55: attempt to index field 'Pilot' (a nil value)
  1. DoKill - lua/entities/pelican/init.lua:55
   2. unknown - lua/entities/pelican/init.lua:80

If anyone can help me please, here's the init.lua:
[HTML]AddCSLuaFile( "cl_init.lua" )
AddCSLuaFile( "shared.lua" )
include('shared.lua')

local DESTROYABLE=true
local HEALTH=500
local FLAMETRAIL=false
local HOVERMODE=true

local soundx=Sound("ambient/atmosphere/undercity_loop1.wav")

function ENT:SpawnFunction( ply, tr)
local SpawnPos = tr.HitPos + tr.HitNormal * 100
local ent = ents.Create( "pelican" )
ent:SetPos( SpawnPos )
ent:Spawn()
ent:Activate()
return ent
end

function ENT:Initialize()
self.Entity:SetNetworkedInt("health",HEALTH)

if (!self.Sound) then
self.Sound = CreateSound( self.Entity, soundx )
end

self.Entity:SetUseType( SIMPLE_USE )

self.Firee=nil
self.Inflight=false
self.Pilot=nil
self.Entity:SetModel("models/pelican.mdl")
self.Entity:PhysicsInit( SOLID_VPHYSICS )
self.Entity:SetMoveType( MOVETYPE_VPHYSICS )
self.Entity:SetSolid( SOLID_VPHYSICS )
local phys = self.Entity:GetPhysicsObject()
if (phys:IsValid()) then
phys:Wake()
phys:SetMass(10000)
end
self.Entity:StartMotionController()
self.Accel=0

self.Roll=0
end

function ENT:DoKill()
local effectdata = EffectData()
effectdata:SetOrigin( self.Entity:GetPos() )
util.Effect( "Explosion", effectdata, true, true )

self.Sound:Stop()

self.Pilot:UnSpectate()
self.Pilot:DrawViewModel(true)
self.Pilot:DrawWorldModel(true)
self.Pilot:Spawn()
self.Pilot:SetNetworkedBool("isDriveShuttle",false)
self.Pilot:SetPos(self.Entity:GetPos()+Vector(0,0,100))
end

function ENT:OnTakeDamage(dmg)
if self.Inflight and DESTROYABLE and not self.Done then
local health=self.Entity:GetNetworkedInt("health")
self.Entity:SetNetworkedInt("health",health-dmg:GetDamage())
local health=self.Entity:GetNetworkedInt("health")
if health<1 then
self.Entity:DoKill()
self.Done=true
self.Entity:Remove()
end
end
end

function ENT:OnRemove()
if (self.Sound) then
self.Sound:Stop()
end
self.Entity:DoKill()
end

function ENT:Think()
if not IsValid(self.Pilot) then self.Pilot=nil self.Inflight=false end
if self.Inflight and self.Pilot and self.Pilot:IsValid() then
if self.Sound then
self.Sound:ChangePitch(math.Clamp(self.Entity:GetVelocity():Length()/5,1,200),0.001)
end
self.Pilot:SetPos(self.Entity:GetPos())
if self.Pilot:KeyDown(IN_USE) then
self.Sound:Stop()

self.Pilot:UnSpectate()
self.Pilot:DrawViewModel(true)
self.Pilot:DrawWorldModel(true)
self.Pilot:Spawn()
self.Pilot:SetNetworkedBool("isDriveShuttle",false)
self.Pilot:SetPos(self.Entity:GetPos()+Vector(0,0,200))

self.Accel=0
self.Inflight=false
if self.Firee then
self.Firee:Remove()
end
self.Entity:SetLocalVelocity(Vector(0,0,0))
self.Pilot=nil
end
self.Entity:NextThink(CurTime())
else
self.Entity:NextThink(CurTime()+1)
end

return true
end

function ENT:Use(ply,caller)
if not self.Inflight then
self.Sound:Play()

self.Entity:GetPhysicsObject():Wake()
self.Entity:GetPhysicsObject():EnableMotion(true)
self.Inflight=true
self.Pilot=ply

ply:Spectate( OBS_MODE_ROAMING )
ply:DrawViewModel(false)
ply:DrawWorldModel(false)
ply:StripWeapons()
ply:SetNetworkedBool("isDriveShuttle",true)
ply:SetNetworkedEntity("Shuttle",self.Entity)

if not FLAMETRAIL then return end
self.Firee = ents.Create("env_fire_trail")
if !self.Firee then return end
self.Firee:SetKeyValue("spawnrate","3")
self.Firee:SetKeyValue("firesprite","sprites/firetrail.spr" )
self.Firee:SetPos(self.Entity:GetPos())
self.Firee:SetParent(self.Entity)
self.Firee:Spawn()
self.Firee:Activate()
end
end

function ENT:PhysicsSimulate( phys, deltatime )
if self.Inflight then
local hovering=false
if HOVERMODE and self.Pilot:KeyDown(IN_SPEED) then
hovering=true
end
self.Entity:SetNetworkedBool("hover",hovering)
local num=0
if self.Pilot:KeyDown(IN_ATTACK) then
num=700
elseif self.Pilot:KeyDown(IN_ATTACK2) then
num=-700
elseif self.Pilot:KeyDown(IN_FORWARD) then
num=700
end

if self.Pilot:KeyDown(IN_MOVELEFT) then
//self.Roll=self.Roll-3
elseif self.Pilot:KeyDown(IN_MOVERIGHT) then
//self.Roll=self.Roll+3
end

phys:Wake()
self.Accel=math.Approach(self.Accel,num,10)
if self.Accel>-200 and self.Accel < 200 and not self.Pilot:KeyDown(IN_ATTACK) and not self.Pilot:KeyDown(IN_ATTACK2) and not self.Pilot:KeyDown(IN_FORWARD) and not hovering then return end
local pr={}
pr.secondstoarrive = 1
pr.pos = self.Entity:GetPos()+self.Entity:GetForward()*self.Accel
pr.maxangular = 5000
pr.maxangulardamp = 10000
pr.maxspeed = 1000000
pr.maxspeeddamp = 10000
pr.dampfactor = 0.8
pr.teleportdistance = 5000
local ang = self.Pilot:GetAimVector():Angle()
ang.r=ang.r+self.Roll
pr.angle = ang
if self.Pilot:KeyDown(IN_SPEED) then
if HOVERMODE and num>0 then
pr.angle=self.Entity:GetAngles()
elseif not HOVERMODE then
pr.angle=self.Entity:GetAngles()
end
end
pr.deltatime = deltatime
phys:ComputeShadowControl(pr)
end
end[/HTML]

[Lapito]

I need help please.