[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?