I'm trying to weld all the parts in this model to the Handle. But it keeps on giving me an error saying bad cast. I don't know how I would do this.

local module = {}

function module.WeldWepTArm(chr, wep)
	
	local clonew = wep:Clone()
	clonew.Name = "Weapon"
	clonew.Parent = chr
	local weld1 = Instance.new("Weld", clonew.Handle)
	weld1.Part0 = clonew.Handle
	weld1.Part1 = chr["Left Arm"]
	weld1.C0 = CFrame.new(-0.1, 0, -1)*CFrame.fromEulerAnglesXYZ(0, -math.pi/2, math.pi/2)
	
	local function weldBetween(a, b)
    	local weld = Instance.new("ManualWeld", a)
   		weld.Part0 = a
    	weld.Part1 = b
    	weld.C0 = a.CFrame:inverse() * b.CFrame
    	return weld
	end
	
	local parts = clonew:GetChildren()
	
	for i,v in pairs(clonew:GetChildren()) do
		if v.Name ~= "Handle" then
			weldBetween(v, clonew.Handle) -- error here, saying bad cast
		end
	end
	
	local cloneww = wep:Clone()
	cloneww.Name = "WepOnBack"
	cloneww.Parent = chr
	local weld2 = Instance.new("Weld", cloneww.Handle)
	weld2.Part0 = cloneww.Handle
	weld2.Part1 = chr.Torso
	weld2.C0 = CFrame.new(1, 0.6, 0)*CFrame.fromEulerAnglesXYZ(math.pi/2, 0, math.pi/4)
	
	for i,v in ipairs(cloneww:GetChildren()) do
		if v.ClassName == "Part" then
			v.Transparency = 1
		end
	end
	
end

return module
Anonymous