Bag argument to wrap lua function expected?

I'm trying to make something akin to a music player, but when I try to call a coroutine I get this error any idea what could be causing it?

local position = game.Players.LocalPlayer.Character:WaitForChild("Position")
local town1 = game.Soundscape.MusicTown
local wild1 = game.Soundscape.MusicWild1 local v1 = 1
local wild2 = game.Soundscape.MusicWild2
local currentPlaying
local timer =0

function changeSong()
	if (timer>= (currentPlaying.TimeLength-1)) and position.Value then
			timer = 0
			for j=currentPlaying.Volume,0,(-(currentPlaying.Volume/50)) do
				currentPlaying.Volume = j
				wait()
			currentPlaying:Stop()
			if currentPlaying == wild1 then
				currentPlaying = wild2
			else
				currentPlaying = wild2
			end
			currentPlaying:Play()
			for j=0,v1,((v1/50)) do
				currentPlaying.Volume = j
				wait()
				end
			end
		end
end

function loop()
	while (wait(1) and position.Value)do
		timer = timer+1
		local cChangeSong = coroutine.wrap(changeSong())
		cChangeSong()
	end
end

position.Changed:connect(function()
	wait(2)
	for i,v in pairs(game.Soundscape:GetChildren()) do
			for j=v.Volume,0,(-(v.Volume/50)) do
				v.Volume = j
				wait()
			end
			v:Stop()
		end
		wait(.5)
		if position.Value then
			wild1:Play()
			currentPlaying = wild1
			for j=0,v1,((v1/50)) do
				wild1.Volume = j
				wait()
				end
			local wLoop = coroutine.wrap(loop())
			wLoop()
		else
			town1:Play()
			for j=0,v1,((v1/50)) do
				town1.Volume = j
				wait()
				end
	end
end)