Need help with minigame script Can't teleporting to work Any help? For time = 1,30

So I am making a mini game and I can't get this script to work

Errors at Line 12

local Map = "WaterRun";
local Time = script.Parent.Time;

local function Intermission(player) 
    for t = 30, 1, -1 do 
        Time.Text = t;
        wait(1);
    end

    for i,v in pairs(game.Players:GetChildren()) do 
        if (Map == "WaterRun") then 
            v:GetPlayerFromCharacter(player); 
            player.Parent.HumanoidRootPart.CFrame = CFrame.new(-207.5, 15.5, 151.5);
        end 
    end 
end
script.Parent.StartRound.MouseButton1Click:Connect(Intermission);

The For Loop syntax is for init, max/min value, increment. Instead of creating a new variable and decrementing from it, you can simply do it inside the for loop.

local Map = "WaterRun";
local Time = script.Parent.Time;
local Pos = CFrame.new(-207.5, 15.5, 151.5);

local function Intermission() 
    for t = 30, 1, -1 do 
        Time.Text = t;
        wait(1);
    end

    for _, plr in pairs(game.Players:GetPlayers()) do
		if (Map == "WaterRun") then
			plr.Character.HumanoidRootPart.CFrame = Pos;
		end
	end
end
script.Parent.StartRound.MouseButton1Click:Connect(Intermission);

Once you started adding in more maps, you will notice that conditional statements are very frustrating to use. To counter that, saving it in a table saves you great deal of time.

local Maps = {
	["WaterMap"] = CFrame.new(100, 100, 100);
	["AnotherMap"] = CFrame.new(200, 200, 200);
}
local Time = script.Parent.Time;

local function string_ChooseMap ()	
	local x = {};
	for a , _ in pairs(Maps) do
    	table.insert(x, a);
	end
	
	local random = x[math.random(#x)];
	
	return random;
end

local function void_Intermission ()
	for i = 30, 1, -1 do
		Time.Text = t;
		print("Time " .. i);
		wait(1);
	end
	
	local map = array_ChooseMap();
	
	for _, plr in pairs(game.Players:GetPlayers()) do
		plr.Character.HumanoidRootPart.CFrame = Maps[map];
    end
end

script.Parent.StartRound.MouseButton1Click:Connect(void_Intermission);