Scripted weapon is not appearing.

[Hellen]

I have made a scripted weapon from a tutorial (I'm fresh out of the water) I typed down the script by every command and I'm not sure what the problem is. I looked at other weapon scripts but they appear more complicated. I hope you guys can find what I did wrong.

-- Basic scripted weapon
-- By Hellsing4682

if (SERVER) then

   AddCSLuaFile ("shared.lua");
 
 
   SWEP.Weight = 5;
   SWEP.AutoSwitchTo = false;
   SWEP.AutoSwitchFrom = false;
 
end
 
if (CLIENT) then
 
 
   SWEP.PrintName = "Chair throwing gun";
   SWEP.Slot = 4;
   SWEP.SlotPos = 1;
   SWEP.DrawAmmo = false;
   SWEP.DrawCrosshair = false;
 
end

SWEP.Author = "Hellsing4682";
SWEP.Contact = "Contact me on Steam.";
SWEP.Purpose = "Launches chairs at your enemies!.";
SWEP.Instructions = "Left click to fire Chair 1, right click to fire Chair 2.";
SWEP.Category = "Test Category"

SWEP.Spawnable = true;
SWEP.AdminSpawnable = true;

SWEP.ViewModel = "models/weapons/v_RPG.mdl";
SWEP.WorldModel = "models/weapons/w_RPG.mdl";

SWEP.Primary.ClipSize = -1;
SWEP.Primary.DefaultClip = -1;
SWEP.Primary.Automatic = false;
SWEP.Primary.Ammo = "none";

SWEP.Secondary.Clipsize = -1;
SWEP.Secondary.DefaultClip = 1;
SWEP.Secondary.Automatic = false;
Swep.Secondary.Ammo = "none";


local ShootSound = Sound ("Metal.SawbladeStick");

function SWEP:Reload ()
end

function SWEP.Think()
end

function SWEP:throw_attack (model_file)
         local tr = self.Owner:GetEyeTrace();
		 
		 self.Weapon:EmitSound (ShootSound);
		 self.BaseClass.ShootEffects (Self);
		 if (!SERVER) then return end;
		 
		 local ent = ents.Create ("prop_physics');
		 ent:SetModel (model_file);
		 ent:SetPos (self.Owner:EyePos() + (self.Owner:GetAimVector() * 16));
		 ent:SetAngles (self.Owner:EyeAngles());
		 ent:Spawn();
		 local phys = ent:GetPhysicsObject();
		 phys:ApplyForceCenter (self.Owner:GetAimVector():GetNormalized() * math.pow(shot_length, 3));
		 cleanup.Add (self.Owner, "props", ent);
		 undo.Create ("Thrown SWEP Entity");
		 undo.AddEntity (ent);
		 undo.SetPlayer (self.Owner);
		 undo.Finish();
end

function SWEP:PrimaryAttack()
         //Call the throw attack function
		 self:throw_attack ("models/props/cs_office/Chair_office.mdl");
end

function SWEP: SecondaryAttack()
         //Call the throw attack function
		 self:throw_attack ("models/props_c17/FurnitureChair001a.mdl");
end