Why is this model return as a nil value?

Whenever I run the script it always gives the error 'ServerScriptService.GenerationSettings:22: attempt to index local 'currentPath' (a nil value)'. I'm not sure why its happening.

The Module Script:

local generateModule = {}

local replicatedStorage = game:GetService('ReplicatedStorage')
local serverStorage = game:GetService('ServerStorage')

local pathLength = 80

local plainPaths = serverStorage:WaitForChild('PlainPaths'):GetChildren()
local obstructionPaths = serverStorage:WaitForChild('ObstructionPaths'):GetChildren()

generateModule.GenerateNewPath = function (currentPathNumber, currentPath)
	
	local decidedPathType = math.random(1, 2)
	if decidedPathType == 1 then
		decidedPath = plainPaths[math.random(1, #plainPaths)]		
	else
		decidedPath = obstructionPaths[math.random(1, #obstructionPaths)]
	end 	
	
	decidedPath:Clone().Parent = workspace
	decidedPath.PathNumber.Value = currentPathNumber + 1
	decidedPath.Position = currentPath.Position + Vector3.new(0, 0, pathLength)
	
	local decidedPathType2 = math.random(1, 2)
	if decidedPathType2 == 1 then
		decidedPath2 = plainPaths[math.random(1, #plainPaths)]		
	else
		decidedPath2 = obstructionPaths[math.random(1, #obstructionPaths)]
	end 	
	
	decidedPath2:Clone().Parent = workspace
	decidedPath2.PathNumber.Value = decidedPath + 1
	decidedPath2.Position = decidedPath.Position + Vector3.new(0, 0, pathLength)
	
	local lastPath = currentPathNumber - 1
	for _, path in pairs (workspace) do
		if path.Name == 'Path1' or path.Name == 'Path2' or path.Name == 'Path3' or path.Name == 'Path4' then
			if path.PathNumber.Value == lastPath then
				path:Destroy()
			end
		end
	end
end



return generateModule

The Touch Script:

local serverStorage = game:GetService('ServerStorage')
local serverScriptService = game:GetService('ServerScriptService')
local replicatedStorage = game:GetService('ReplicatedStorage')

local generationModule = require(serverScriptService.GenerationSettings)

local path = script.Parent.Parent
local pathNumber = path:WaitForChild('PathNumber')

function onTouch(hit)
	local humanoid = hit.Parent:FindFirstChild('Humanoid')
	if pathNumber.Value > 3 and humanoid then
		generationModule.GenerateNewPath(pathNumber.Value, path)
		script.Disabled = true
	end
end

script.Parent.Touched:connect(onTouch)