How do I fix this?

I don't know what's wrong here, the first time it works fine, but after resetting and touching the giver again, it won't work. Output doesn't show any errors whatsoever.

function onTouched(hit)
	if hit.Parent:findFirstChild("Humanoid") ~= nil and hit.Parent:findFirstChild("Backpack") == nil then

		local h = hit.Parent:findFirstChild("Humanoid")
		if h ~= nil then
			gui = script:GetChildren()
				for i=1, #gui do
					if gui[i].className == "GuiMain" then
						x = gui[i]:clone()
						player = game.Players:GetPlayerFromCharacter(hit.Parent)
							if player ~= nil then
								x.Parent = player.PlayerGui
							else
								print("Cataphract failed.")
							end
					end
				end
		end

		local g = game.Lighting.Backpack:clone()
		g.Parent = hit.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 = hit.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
end

script.Parent.Touched:connect(onTouched)

Is it possible that the line in your code that says: ~~~~~~~~~~~~~~~~~ hit.Parent:findFirstChild("Backpack") == nil then

should have **~=** instead of **==**?

An output log, including the error it returns, would be useful..