Welding script not working?

Player = script.Parent.Parent

x = Instance.new("Part")
x.Size = Vector3.new(1, 3, 1)
x.TopSurface = "Smooth"
x.BottomSurface = "Smooth"
x.BrickColor = BrickColor.new("Mild Gray")
x.Reflectance = 0.3

x.Parent = c
game.Debris:AddItem(x,5)

w1 = Instance.new("Weld", c)
w1.Part0 = w1.Parent["Right Arm"]
w1.Part1 = x
w1.C1 = CFrame.fromEulerAnglesXYZ(0, 0, 0) *CFrame.new(0, 0, 0)

Is the script. I get a problem saying Players.Sarcasticly.Backpack.Script:14: attempt to call field 'Parent' (a nil value) Any help?