Module only returns one value, yet it errors

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#1

Module:

local Module = {}

function Module:ScreenShake(move)
	local length = 0
	if move == 'heavyattack' then
		length = .15
	elseif move == 'blockbreakground' then
		length = .15
	elseif move == 'blockbreakair' then
		length =  .25
	end
	return length
end

Local Function:

tool.Action.OnClientEvent:Connect(function(action,tuple1,tuple2)
	if action == 'screenshake' then
		local fx = require(tool.FX)
		local st = fx:ScreenShake(tuple1)
		local otfx = true
			local toggle = coroutine.wrap(function()
			wait(st)
			otfx = false
		end)
		toggle()
		while otfx == true do
			wait()
			local currenttime = tick()
			local bobbleX = math.cos(currenttime * 30 ) * 1
			local bobbleY = math.abs(math.sin(currenttime * 30 )) * 1
			local bobble = Vector3.new(bobbleX,bobbleY,0)
			char.Humanoid.CameraOffset = char.Humanoid.CameraOffset:lerp(bobble,.25)
		end
	end
end)

This only returns one value, but the value changes, why’s it firing the error “Module did not return exactly one value”?

#2

I found at the bottom of my script that I have accidentally deleted the return Module part. F.

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