?Map changger i cant figure out what this error means at all

Ok so i made a map changer script but i cant figure out what the error is what i need to do he is the error 12:17:12.599 - Players.Player1.PlayerGui.InGameGui.Frame.TextBox.LocalScript:20: attempt to index local 'map' (a nil value)

while wait() do
	if script.Parent.Parent.Ended.Value == 1 then 

for i = 30,0, - 1 do
	local Text = script.Parent
	local Frame = script.Parent.Parent 
	Text.Text = i
	wait(1)
	if i == 0 then
		
		script.Parent.Parent.Ended.Value = 0
		spawnmap = game.Workspace.Spawnmap
		spawnmap.Value = 1 
		Text.Visible = false
		Frame.TextBox2.Text = "ROUND STARTING"
		wait(3)
		Text.Visible = false
		Frame.TextBox2.Text = "12 HOURS TELL DAY"
		local map = game.Workspace:FindFirstChild("Map"..spawnmap.Value)
		local target = map.thing.Position
		Players = game.Players:GetPlayers()
		local player = game.Players.LocalPlayer
		Num = Instance.new("IntValue",player)
		Num = math.random(1,#Players)
		if Num == 1 then
			player.PlayerGui.IngameGui.BackGround.Visible = true
		end
		if player.Shop.Value == 0 then
		player.Character:MoveTo(target)
	Min = 30
	Sec1 = 0
	Sec  = 0 -- both should start at 0 
	Text.Text = Min..":"..Sec1..Sec
	for i = 600,0,-1 do
		wait(1)
		print(i)
		if i == 600 then
			Min = 9
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 540 then
			Min = 8
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 480 then
			Min = 7
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 420 then
			Min = 6
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 360 then
			Min = 5
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 300 then
			Min = 4
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 240 then
			Min = 3
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 180 then
			Min = 2 
			Sec1 = 5
			Sec = 9 
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 120 then
			Min = 1
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec
		elseif i == 60 then
			Min = 0
			Sec1 = 5
			Sec = 9
		Text.Text = Min..":"..Sec1..Sec 	
		 else
			Sec = Sec - 1 
			if Sec == -1 then
				Sec1 = Sec1 - 1 
				Sec = 9
			
			end
		Text.Text = Min..":"..Sec1..Sec
		end
			
		
	end
		
	end

Num:Destroy()
		end

When you see an error message attempt to index local 'map' (a nil value) (where 'map' can be replaced by any variable name), this means that you have an unexpected nil value. That is, you're telling the script on line 20 to get "map.thing.Position", which requires that 'map' and 'map.thing' are both non-nil -- yet, the error is telling you, 'map' is nil. It is illegal to try and index a nil value (that is, attempt to do "nil.thing" or "nil.Value" or "nil.Anything"), hence the error.

So we go to the previous lines. Line 19 is where you try and assign 'map' a value. How might 'map' be nil there? If "workspace.Map1" does not exist (since 'spawnmap.Value = 1' as of line 13).

Some other problems with your script:

• Indentation. After every 'if', 'for', 'while', 'function' (anything that opens a 'block' and must be ended with 'end'), you should have one more indentation than before until you get to the corresponding 'end'. ex:

function example()
	randomCode()
	if condition then
		print("hi")
	elseif otherCondition then
		doSomething()
	else
		doSomethingElse()
	end
	for i = 1, 2 do
		for j = 100, 200 do
			print(i, j, i+j)
		end
	end
end

• On line 34 you start a new for loop using the same variable name you use on line 4. This hides the 'i' declared on line 4, meaning you cannot access it in your inner for loop. You should use a different variable name (ex, j) so that you access both for-loop variables.
• Lines 37-94 are very similar, which almost always means there's a better way to do it. In this case, math and string.format will suffice; the following bit replaces lines 34 to 98:

for timeLeft = 599, 0, -1 do
	print(i)
	Text.Text = string.format("%d:d", math.floor(timeLeft / 60), timeLeft % 60)
	wait(1)
end

Changes:

• Start at 599 and you will wait for exactly 10 minutes rather than 10 minutes and one second. Further, the first time displayed will be 9:59, just like you had originally.
• Look up string.format in lua's String Library Tutorial and/or experiment with it yourself. It returns the same string you give it as the first argument, but with %d replaced with the number you give it as an argument (and it can accept any number of arguments). The d means "Always show two digits even if the number is less than 10".
• math.floor(timeLeft / 60) gets the number of minutes left
• timeLeft % 60 gets rid of the minutes so that you're just left with seconds (% 60 is sort of like subtracting 60 repeatedly until the value is 59 or less)
• I put the wait(1) after the Text.Text so that the 0:00 part will display for a full second. Further, 9:59 will show up immediately rather than after a full second of waiting.