[Answered] How to fix attempt to call global 'selectMap' (a nil value) error?

This is my script;

local replicatedStorage = game:GetService("ReplicatedStorage")
local maps = replicatedStorage:WaitForChild("Maps")
 
function pickMap()
	local mapList = maps:GetChildren() -- Declares a table of the maps inside of the Maps folder.
	local selectedIndex = math.random(1,#maps) -- Choose a random number between 1, and the number of maps available.
	local map = mapList[selectedIndex]:Clone() -- Create a clone of the map we selected.
	map.Parent = workspace -- Parent it to the workspace.
	map.Name = "Map" -- Rename the map so that we can use the unloadMap() function later to remove it.
	return mapList[selectedIndex].Name -- Return the name of the map we selected, in case we want to display it.
end
 
function unloadMap()
	if workspace:FindFirstChild("Map") then -- If there is a model in the Workspace named "Map"
		workspace.Map:Destroy() -- Destroy it!
	end
end
 
local h = Instance.new("Hint")
h.Parent = workspace
 
while true do
	h.Text = "Picking new map..."
	wait(3)
	local mapName = selectMap()
	h.Text = "Selected map: "..mapName
	wait(3)
	h.Text = "Unloading map..."
	unloadMap()
	wait(3)
end

This is the error;

22:02:30.007 - Workspace.MapChooser:25: attempt to call global 'selectMap' (a nil value)
22:02:30.009 - Stack Begin
22:02:30.010 - Script 'Workspace.MapChooser', Line 25
22:02:30.011 - Stack End

The error is here; local mapName = selectMap()

How would I fix this error?