is derived from non existant SWEP (weapon_cs_base)

[cjburkey01]

So, I'm getting this error when I try to use my wepon:

Giving [CJ]cjburkey01 a pistol-machine-sohtgun
SWEP (pistol-machine-sohtgun) is derived from non existant SWEP (weapon_cs_base) - Expect errors

And here is my code:

SWEP.PrintName = "Shotgun Machin Pistol"			
SWEP.Author = "CJ Burkey"
SWEP.Instructions = "Left mouse to fire!"

SWEP.Spawnable = true
SWEP.AdminOnly = true

SWEP.Primary.ClipSize = 100
SWEP.Primary.DefaultClip = 100
SWEP.Primary.Automatic = true
SWEP.Primary.Ammo = "smg1"
SWEP.Primary.Recoil = 1.5

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

SWEP.Weight = 5
SWEP.AutoSwitchTo = false
SWEP.AutoSwitchFrom = false

SWEP.Slot = 1
SWEP.SlotPos = 2
SWEP.DrawAmmo = false
SWEP.DrawCrosshair = true

SWEP.IronSightsPos = Vector( -5.403, -9.5924, 4.2472 )
SWEP.IronSightsAng = Vector( -0.7108, 0.6869, 2.0394 )

SWEP.ViewModel = "models/weapons/v_pistol.mdl"
SWEP.WorldModel = "models/weapons/w_pistol.mdl"

SWEP.Base = "weapon_cs_base"

local ShootSound = Sound("Weapon_Pistol.Single")
local EmptySound = Sound("Weapon_Pistol.Empty")
local ReloadSound = Sound("Weapon_Pistol.Reload")

function SWEP:PrimaryAttack()
	
	if(self:CanPrimaryAttack()) then
		
		self:ShootBullet(50, 5, 0.05)
		self.Weapon:SetNextPrimaryFire(CurTime() + 0.05)
		
	end
	
end

function SWEP:CanPrimaryAttack()
	
	if (self.Weapon:Clip1() <= 0) then
		
		self:EmitSound(EmptySound)
		self:SetNextPrimaryFire(CurTime() + 0.2)
		self:Reload()
		return false
		
	end

	return true

end

function SWEP:TakePrimaryAmmo( num )
	
	if ( self.Weapon:Clip1() <= 0 ) then 
	
		if ( self:Ammo1() <= 0 ) then return end
		
		self.Owner:RemoveAmmo( num, self.Weapon:GetPrimaryAmmoType() )
	
	return end
	
	self.Weapon:SetClip1( self.Weapon:Clip1() - num )	
	
end

function SWEP:Reload()
	if self.ReloadingTime and CurTime() <= self.ReloadingTime then return end
	if ( self:Clip1() < self.Primary.ClipSize and self.Owner:GetAmmoCount( self.Primary.Ammo ) > 0 ) then
		self:DefaultReload( ACT_VM_RELOAD )
		local AnimationTime = self.Owner:GetViewModel():SequenceDuration()
		self.ReloadingTime = CurTime() + AnimationTime
		self:SetNextPrimaryFire(CurTime() + AnimationTime)
		self:SetNextSecondaryFire(CurTime() + AnimationTime)
	end
end

function SWEP:ShootBullet(damage, num_bullets, aimcone)
 
	local bullet = {}
	bullet.Num = num_bullets
	bullet.Src = self.Owner:GetShootPos()
	bullet.Dir = self.Owner:GetAimVector()
	bullet.Spread = Vector( aimcone, aimcone, 0 )
	bullet.Tracer = 5
    bullet.TracerName = "Tracer"
	bullet.Force = 1
	bullet.Damage = damage
	bullet.AmmoType = "smg1"
	
	self:TakePrimaryAmmo(1);
	
	self:EmitSound(ShootSound)
	self.Owner:FireBullets(bullet)
	self:ShootEffects()
 
end

Why is this. I have counter strike source

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