I get the error Gui is not a member of PlayerGui, but not in studio. Can anybody help?

Hey, I'm working on a Floor Is Lava game, yes I know but it's just a starter game as I'm learnng LUA. I've gone off the disaster script (oh no!) but I've actually redone it a bit and have converted and updated it to be more modern like (guis and stuff), the only thing, everytime I join the game get the error "Times is not a member of PlayerGui", and the game is FE enabled, however I tried without FE and still no luck.

It works completely fine in Studio, please help. Thanks.

Here is my game script

disasters = {"DoubleTrouble"}


countdownTime = 30 
disasterTime = 40 -- not needed

countdownMessage = "%s"
disasterMessage = "%s" -- not needed


items = {}
leaderboard = game.Workspace:findFirstChild("BTS Leaderboard")
local w = game.Workspace:getChildren()
for i=1,#w do
	if w[i].Name == "leaderboard" and w[i]:findFirstChild("running") ~= nil and w[i]:findFirstChild("points") ~= ni then
		leaderboard = w[i]
	end
end
for i=1,#disasters do
	local item = game.Lighting:findFirstChild(disasters[i])
	if item ~= nil then
		item.Parent = nil
		table.insert(items, item)
	else
		print("Error! ", disasters[i], " was not found!")
	end
end

function chooseDisaster()
	return items[math.random(#items)]
end

function sethint(text)
	local players = game.Players:GetChildren()
	for i,v in pairs(players) do
		print(v)
		if (v.PlayerGui.Timers.Timer ~= nil) then
			v.PlayerGui.Timers.Timer.Text = text
		end
	end
end

function lavaRising()
	local players = game.Players:GetChildren()
for i, v in pairs(players) do
	if (v.PlayerGui.Timers.Timer ~= nil) then
		 v.PlayerGui.Timers.BigLabel.Text = "The Lava Is Rising In"
                v.PlayerGui.Timers.Timer.Text = "10"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "9"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "8"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "7"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "6"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "5"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "4"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "3"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "2"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "1"
                wait(1)
                v.PlayerGui.Timers.Timer.Text = "0"
                wait(1)
	end
end
end

function gameEnd()
	local players = game.Players:GetChildren()
for i, v in pairs(players) do
	if (v.PlayerGui.Timers.Timer ~= nil) then
		 v.PlayerGui.Timers.BigLabel.Text = "Intermission"
	end
end
end

function timeLeft()
	local players = game.Players:GetChildren()
	for i, v in pairs(players) do
		if (v.PlayerGui.Timers.Timer ~= nil) then
			v.PlayerGui.Timers.Timer.Text = "30"
			v.PlayerGui.Timers.BigLabel.Text = "Time Left"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "29"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "28"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "27"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "26"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "25"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "24"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "23"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "22"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "21"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "20"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "19"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "18"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "17"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "16"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "15"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "14"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "13"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "12"
			wait(1)
			v.PlayerGui.Timers.Timer.Text = "11"
			wait(1)
            v.PlayerGui.Timers.Timer.Text = "10"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "9"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "8"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "7"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "6"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "5"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "4"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "3"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "2"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "1"
            wait(1)
            v.PlayerGui.Timers.Timer.Text = "0"
            wait(1)
		end
	end
end

function countdown(time)
	sethint(string.format(countdownMessage, tostring(time)))
	while (time > 0) do
		wait(1)
		time = time - 1
		sethint(string.format(countdownMessage, tostring(time)))
	end
	return true
end

wait(10)
while true do
	countdown(countdownTime)

	if leaderboard ~= nil and leaderboard:findFirstChild("running") and leaderboard:findFirstChild("points") then -- For use with my BTS leaderboard.
		leaderboard.points.Value = 15
		leaderboard.running.Value = true
	end

	local m = chooseDisaster():clone()

    if disasterMessage ~= nil then
        local players = game.Players:GetChildren()
        for i,v in pairs(players) do
            if (v.PlayerGui.Timers.Timer ~= nil) then
                v.PlayerGui.Timers.Timer.Text = string.format(disasterMessage, m.Name)
                v.PlayerGui.Timers.BigLabel.Text = "Map Chosen!"
                wait(3)
            end
        end
    end

	m.Parent = game.Workspace
	m:makeJoints()
	lavaRising()
	timeLeft()
	m:remove()
	gameEnd()

	if leaderboard ~= nil then -- For use with the bts leaderboard.
		leaderboard.running.Value = false
	end
end

The problem you have is that you must use p.PlayerGui:WaitForChild("Timers")

If this helped please approve this answer! Thanks!

I did some tweaking, here and there, Like for example, you used depricated functions, You didn't use for loops(Makes your code shorter and saves a lot of time), Plus there is a big diffrence 196 and 112 lines of code You spelled nil incorrect, And I also recommend WaitForChild instead of FindFirstChild

disasters = {"DoubleTrouble"}


countdownTime = 30 
disasterTime = 40 -- not needed

countdownMessage = "%s"
disasterMessage = "%s" -- not needed


items = {}
leaderboard =	workspace:WaitForChild("BTS Leaderboard")
local w = workspace:GetChildren() -- Its not getChildren() its GetChildren()
for i=1,#w do
    if w[i].Name == "leaderboard" and w[i]:WaitForChild("running") ~= nil and w[i]:WaitForChild("points") ~= nil then -- you did ni instead of nil
        leaderboard = w[i]
    end
end
for i=1,#disasters do
    local item = game.Lighting:WaitForChild(disasters[i])
    if item ~= nil then
        item.Parent = nil -- Why make item.Parent nil??
        table.insert(items, item)
    else
        print("Error!  "..disasters[i] .. " was not found!") -- You don't use a comma to connect strings, you use two dots to connect strings
    end
end

function chooseDisaster()
    return items[math.random(0,#items)] -- math.random has two arguments minimum value and a maximum value
end

function sethint(text)
    local players = game.Players:GetChildren()
    for i,v in pairs(players) do
        print(v)
        if v.PlayerGui.Timers.Timer ~= nil then
            v.PlayerGui.Timers.Timer.Text = text
        end
    end
end

function lavaRising()
    local players = game.Players:GetChildren()
for i, v in pairs(players) do
    if v.PlayerGui.Timers.Timer ~= nil then
         v.PlayerGui.Timers.BigLabel.Text = "The Lava Is Rising In"
         for lavaRise = 10,0,-1 do  v.PlayerGui.Timers.Timer.Text end -- For loops make your games proffesional and makes things easier to read
    end
end
end

function gameEnd()
    local players = game.Players:GetChildren()
for i, v in pairs(players) do
    if v.PlayerGui.Timers.Timer ~= nil then
         v.PlayerGui.Timers.BigLabel.Text = "Intermission"
    end
end
end

function timeLeft()
    local players = game.Players:GetChildren()
	for i, v in pairs(players) do
	 v:WaitForChild("PlayerGui"):WaitForChild("Timers").BigLabel.Text = "Time Left"
        if v:WaitForChild("PlayerGui").Timers.Timer ~= nil then
        for i = 30,0,-1 do v.PlayerGui.Timers.Timer.Text = i wait(1) end -- For loops are make your game more proffesional and it'll be more easier to read   
        end
    end
end

function countdown(time)
    sethint(string.format(countdownMessage, tostring(time)))
    while time > 0 do
        wait(1)
        time = time - 1
        sethint(string.format(countdownMessage, tostring(time)))
    end
    return true
end

wait(10)
while true do
    countdown(500)

    if leaderboard ~= nil and leaderboard:WaitForChild("running") and leaderboard:WaitForChild("points") then -- For use with my BTS leaderboard.
        leaderboard.points.Value = 15
        leaderboard.running.Value = true
    end

    local m = chooseDisaster():Clone() -- Its not clone() its Clone()

    if disasterMessage ~= nil then
        local players = game.Players:GetChildren()
        for i,v in pairs(players) do
            if (v.PlayerGui.Timers.Timer ~= nil) then
                v.PlayerGui.Timers.Timer.Text = string.format(disasterMessage, m.Name)
                v.PlayerGui.Timers.BigLabel.Text = "Map Chosen!"
                wait(3)
            end
        end
    end
    m.Parent = workspace 
    m:makeJoints()
    lavaRising()
    timeLeft()
    m:remove()
    gameEnd()
    if leaderboard ~= nil then -- For use with the bts leaderboard.
        leaderboard.running.Value = false
    end
end

Hopefully this fixed your script and made it more efficient