I have run into an error with a script I'm using (CFrame) can I please have some help on this?

When I enter the test server for my game the part of the script where I get errors is at line 363,

RLWF:Destroy() LLWF:Destroy()

Once in game the server tells me the error and says "Destroy is not a valid member of CFrame" what way is there to fix this?

function DestroyLegWelds()
RLC = New("Motor6D",chara.Torso,"Right Hip",{Part0 = chara.Torso,Part1 = chara["Right Leg"],C0 = CFrame.new(1, -1, 0, 0, 0, 1, 0, 1, -0, -1, 0, 0),C1 = CFrame.new(0.5, 1, 0, 0, 0, 1, 0, 1, -0, -1, 0, 0),})
LLC = New("Motor6D",chara.Torso,"Left Hip",{Part0 = chara.Torso,Part1 = chara["Left Leg"],C0 = CFrame.new(-1, -1, 0, 0, 0, -1, 0, 1, 0, 1, 0, 0),C1 = CFrame.new(-0.5, 1, 0, 0, 0, -1, 0, 1, 0, 1, 0, 0),})
RLWF:Destroy()
LLWF:Destroy()
end

RLWF = CFrame.new(-.5, 2, 0) * CFrame.fromEulerAnglesXYZ(0,0,0)
LLWF = CFrame.new(.5, 2, 0) * CFrame.fromEulerAnglesXYZ(0,0,0)

RLW.Part0 = chara["Right Leg"]
RLW.C0 = RLWF
LLW = Instance.new("Weld",chara["Left Leg"])
LLW.Part1 = HC.Parent
LLW.Part0 = chara["Left Leg"]
LLW.C0 = LLWF