Wepon ERRORS SetDeploySpeed

Why am I getting these errors

[lua]
SWEP (weapon_sg550) is derived from non existant SWEP (weapon_cs_base) - Expect errors!

[ERROR] …odes/flood1.813/entities/weapons/weapon_sg550/shared.lua:136: attempt to call method ‘SetDeploySpeed’ (a nil value)

  1. unknown - …odes/flood1.813/entities/weapons/weapon_sg550/shared.lua:136

SWEP (base) is derived from non existant SWEP (weapon_cs_base) - Expect errors!
S
[/lua]

entities/weapons/weapon_sg550/shared.lua
[lua]
–line: 137
self.Weapon:SetDeploySpeed( self.WeaponDeploySpeed )
[/lua]