Why can I not destroy a map in a game?

So I am making a game and I have a maps that are randomly picked and after the round I am trying to destroy them with :Destroy() but it wont work. Can someone help me with this? Everything else works except this.

Code

Maps = {"Campout", "Pyramid", "Temple"}
intermission = 5 -- time until flood comes
gamewait = 5 -- how long the flood stays
numofplayers = 1 -- How many players are required to play
timebeforeround = 5 --Time before flood
	wait()    

function m(update)
	c = game.Players:GetChildren()
	for i=1, #c do
		   c[i].PlayerGui.InformationGui.Frame.TextLabel.Text = "" .. update
	end
end



while true do
	wait(1)
	if game.Players.NumPlayers >= numofplayers then
	
	for i=1, intermission do
		wait()
		m("The next flood will strike in: " .. intermission -i)
		wait(1)
	end
	
	pl = game.Players:GetChildren()
	
	for i=1, #pl do
		pl[i].Playing.Value = true
	end
	
	
	rndum = math.random(#Maps)
	cmap = Maps[rndum] -- This picks a random map
	
	game.Lighting[cmap]:Clone().Parent = game.Workspace
	
	m("Picking a map .")
	wait(1)
	m("Picking a map ..")
	wait(1)
	m("Picking a map ...")
	wait(1)
	m("The chosen map is " .. cmap)
	wait(2)
	
	plpl = game.Players:GetChildren()
	
	for i=1, #plpl do
	if plpl[i].Playing.Value == true then
		cspawn = game.Workspace.Part
		target = CFrame.new(cspawn.Position)
for i, player in ipairs(game.Players:GetChildren()) do
   if player.Character and player.Character:FindFirstChild("HumanoidRootPart") then
      player.Character.HumanoidRootPart.CFrame = target + Vector3.new(0, i * 5, 0)
   end
end
		
		--plpl[i].Character.Humanoid.WalkSpeed = 0
	end
	end
	
	
for i=1, timebeforeround do
	m("The Flood is coming in " .. timebeforeround - i)
	wait(1)
end	

m("It's here!")
local platform = workspace.Place.Platform
platform.Material = "Foil"
platform.Size = Vector3.new(500,100,300)
local storage = game:GetService("Lighting")
local part = storage["Kill"]:clone()
part.Parent = platform
part.Disabled = false

wait(1)
	
getlpa = game.Players:GetChildren()


for i=1, #getlpa do
	if getlpa[i].Playing.Value == true then
	getlpa[i].Character.Humanoid.WalkSpeed = 16
	lp = getlpa[i]:GetChildren()
	for b=1, #lp do
		--if lp[b].ClassName == "Tool" then
		--lp[b]:Clone().Parent = getlpa[i].Backpack
		end
	end
	end
end


	
	for i=1, gamewait do
		m("The Flood ends in: " .. gamewait - i)
		wait(1)
	end
	
	
	getlpas = game.Players:GetChildren()
	
	m("The Flood is gone.")
	local platform = workspace.Place.Platform
platform.Material = "Cobblestone"
platform.Size = Vector3.new(500,2,300)
platform.Kill:Destroy()
cmap = Maps[rndum] -- This picks a random map
cmap:Destroy(cmap)
cmap.Parent = workspace
end

there are two problems I see and I hope I can help here they are:

-- first rndum on line 34 should be like this
local rndum = math.random(1, #Maps)
-- second and this should solve your problem is that when calling destroy you dont put anything in the brackets here is what it should look like:
cmap:Destroy()