Why Won't This Work?

Morph = game.Morph

if script.Parent:findFirstChild("Humanoid") ~= nil and script.Parent:findFirstChild("Arm1") == nil then
		local g = Morph.Arm1:clone()
		g.Parent = script.Parent
		local C = g:GetChildren()
		for i=1, #C do
			if C[i].className == "Part" then
				local W = Instance.new("Weld")
				W.Part0 = g.Middle
				W.Part1 = C[i]
				local CJ = CFrame.new(g.Middle.Position)
				local C0 = g.Middle.CFrame:inverse()*CJ
				local C1 = C[i].CFrame:inverse()*CJ
				W.C0 = C0
				W.C1 = C1
				W.Parent = g.Middle
			end
				local Y = Instance.new("Weld")
				Y.Part0 = script.Parent["Left Arm"]
				Y.Part1 = g.Middle
				Y.C0 = CFrame.new(0, 0, 0)
				Y.Parent = Y.Part0
		end

		local h = g:GetChildren()
		for i = 1, # h do
			h[i].Anchored = false
			h[i].CanCollide = false
		end
		
	end

	if script.Parent:findFirstChild("Humanoid") ~= nil and script.Parent:findFirstChild("Arm2") == nil then
		local g = Morph.Arm2:clone()
		g.Parent = script.Parent
		local C = g:GetChildren()
		for i=1, #C do
			if C[i].className == "Part" then
				local W = Instance.new("Weld")
				W.Part0 = g.Middle
				W.Part1 = C[i]
				local CJ = CFrame.new(g.Middle.Position)
				local C0 = g.Middle.CFrame:inverse()*CJ
				local C1 = C[i].CFrame:inverse()*CJ
				W.C0 = C0
				W.C1 = C1
				W.Parent = g.Middle
			end
				local Y = Instance.new("Weld")
				Y.Part0 = script.Parent["Right Arm"]
				Y.Part1 = g.Middle
				Y.C0 = CFrame.new(0, 0, 0)
				Y.Parent = Y.Part0
		end

		local h = g:GetChildren()
		for i = 1, # h do
			h[i].Anchored = false
			h[i].CanCollide = false
		end
		
	end

	if script.Parent:findFirstChild("Humanoid") ~= nil and script.Parent:findFirstChild("Leg1") == nil then
		local g = Morph.Leg1:clone()
		g.Parent = script.Parent
		local C = g:GetChildren()
		for i=1, #C do
			if C[i].className == "Part" then
				local W = Instance.new("Weld")
				W.Part0 = g.Middle
				W.Part1 = C[i]
				local CJ = CFrame.new(g.Middle.Position)
				local C0 = g.Middle.CFrame:inverse()*CJ
				local C1 = C[i].CFrame:inverse()*CJ
				W.C0 = C0
				W.C1 = C1
				W.Parent = g.Middle
			end
				local Y = Instance.new("Weld")
				Y.Part0 = script.Parent["Left Leg"]
				Y.Part1 = g.Middle
				Y.C0 = CFrame.new(0, 0, 0)
				Y.Parent = Y.Part0
		end

		local h = g:GetChildren()
		for i = 1, # h do
			h[i].Anchored = false
			h[i].CanCollide = false
		end
		
	end

	if script.Parent:findFirstChild("Humanoid") ~= nil and script.Parent:findFirstChild("Leg2") == nil then
		local g = Morph.Leg2:clone()
		g.Parent = script.Parent
		local C = g:GetChildren()
		for i=1, #C do
			if C[i].className == "Part" then
				local W = Instance.new("Weld")
				W.Part0 = g.Middle
				W.Part1 = C[i]
				local CJ = CFrame.new(g.Middle.Position)
				local C0 = g.Middle.CFrame:inverse()*CJ
				local C1 = C[i].CFrame:inverse()*CJ
				W.C0 = C0
				W.C1 = C1
				W.Parent = g.Middle
			end
				local Y = Instance.new("Weld")
				Y.Part0 = script.Parent["Right Leg"]
				Y.Part1 = g.Middle
				Y.C0 = CFrame.new(0, 0, 0)
				Y.Parent = Y.Part0
		end

		local h = g:GetChildren()
		for i = 1, # h do
			h[i].Anchored = false
			h[i].CanCollide = false
		end
		
	end

if script.Parent:findFirstChild("Humanoid") ~= nil and script.Parent:findFirstChild("Chest1") == nil then
	local g = Morph.Chest1:clone()
	g.Parent = script.Parent
	local C = g:GetChildren()
	for i=1, #C do
		if C[i].className == "Part" then
			local W = Instance.new("Weld")
			W.Part0 = g.Middle
			W.Part1 = C[i]
			local CJ = CFrame.new(g.Middle.Position)
			local C0 = g.Middle.CFrame:inverse()*CJ
			local C1 = C[i].CFrame:inverse()*CJ
			W.C0 = C0
			W.C1 = C1
			W.Parent = g.Middle
		end
			local Y = Instance.new("Weld")
			Y.Part0 = script.Parent.Torso
			Y.Part1 = g.Middle
			Y.C0 = CFrame.new(0, 0, 0)
			Y.Parent = Y.Part0
	end
		local h = g:GetChildren()
	for i = 1, # h do
		h[i].Anchored = false
		h[i].CanCollide = false
	end
end

script:remove()

Can you at least tell us where there's an error?

Also, try to avoid using free-modeled scripts.