Workspace.Attach:13: attempt to index nil with 'FindFirstChild' ?

Pretty much this is a RemoteEvent Script for Purchasing a bag from the shop, works but cannot find the Backpack on line 13

local attached = game.ReplicatedStorage.Events.Attached

local function attach(player)
	local stats = player.Bags
	local coins = player.leaderstats:FindFirstChild("????Coins")
		-- Variables 
	local character = script.Parent:FindFirstChild(player)
	local backpack = "Backpack"
	--
	wait()
	if stats.Equipped.Value == 1 then
		coins.Value = coins.Value - 500
		local oldbag = character:FindFirstChild(backpack)
		oldbag:Destroy()
		local torso = script.Parent:WaitForChild(player).Attach
		local weld = Instance.new("Weld")
		local clone = game.ReplicatedStorage.Backpacks.Backpacklvl2:Clone()
		clone.Parent = character
		clone.Name = "Backpack"
		weld.Parent = clone
		clone.Bag.CFrame = character.Attach.CFrame * CFrame.Angles(-165, math.pi, 55)
		weld.Part0 = clone.Bag
		weld.C0	= clone.Bag.CFrame:inverse()
		weld.Part1 = torso
		weld.C1 = torso.CFrame:inverse()
		clone.Bag.CanCollide = false
	end
end

attached.OnServerEvent:Connect(attach)