Trying to make a fade function, but i cant make the script understand that the time is in the function

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1

Hey! so im making a fade part function for my game and im stuck in a problem, the script is that the script isnt knowing that the time for the tween to apply is set by the function, i dont know if i explained right but you will understand the error at the script

Can anyone help me fix that?
The Script

local tweenservice = game:GetService("TweenService")
local tower = workspace.Tower

function fade(part, ftime, fcooldown)
	local fadingpart = part
	
	while true do
		if fadingpart == nil then
			print("Breaked lol")
			break
		end
		
		local fadetime = tonumber(ftime) or 1
		local fadecooldown = tonumber(fcooldown) or 0.5
		
		--// The Lines with errors
		local fadeout = tweenservice:Create(fadingpart, TweenInfo.new(fadetime, Enum.EasingStyle.Linear), {Transparency = 0.925})
		local fadein = tweenservice:Create(fadingpart, TweenInfo.new(fadetime, Enum.EasingStyle.Linear), {Transparency = 0})
		--//
		
		fadeout:Play()
		fadeout.Completed:Wait()
		
		task.wait(fadecooldown)
		
		fadein:Play()
		fadein.Completed:Wait()
		
		task.wait(fadecooldown)
	end
end

for _,v in pairs(tower:GetDescendants()) do
	if v:FindFirstChild("fadepart") then
		coroutine.wrap(fade)(v, v.FTime, v.Cooldown)
	end
end

tower.DescendantAdded:Connect(function(v)
	if v:FindFirstChild("fadepart") then
		coroutine.wrap(fade)(v, v.FTime, v.Cooldown)
	end
end)

coroutine.wrap(fade)(workspace.FadingPart, workspace.FadingPart.FTime, workspace.FadingPart.Cooldown)