TextLabel appears but does not disappear? What is wrong with the script?

Hello. Here is my script for making a ScreenGui TextLabel visible, then invisible. The script makes the Gui visible but doesn't turn it invisible. What is wrong with the script?

Thanks! EDIT: Here is the entire script, to make sure that I am not doing anything else incorrectly that is messing with the GUI

if game.Players.NumPlayers >= 2 then
	playgame()
else
	moreplayers()
end

function playgame()
	print("playgame")
game.Players.PlayerGui.ScreenGui.moreplayers.Visible=false
local beginning = game.Players.PlayerGui.ScreenGui.beginning
beginning.Visible=true
wait(5)
beginning.Visible=false

local modelOfBricks = game.Workspace.spawnwalls 
local nameOfBricks = "spawnwall"

for i,v in pairs(modelOfBricks:GetChildren()) do
    if v.Name == nameOfBricks then
        v.Transparency = 1 
		v.CanCollide=false
    end
end

local go = game.Players.PlayerGui.ScreenGui.go
go.Visible=true
wait(4)
go.Visible=false

wait(10) --END OF ROUND

local roundend = game.Players.PlayerGui.ScreenGui.roundend
roundend.Visible=true
wait(4)
roundend.Visible=false

for i, player in ipairs(game.Players:GetPlayers()) do
	if player.Character then
		local hum = player.Character:FindFirstChild('Humanoid')
		if hum then
			hum.Health = 0
		end
	end
end


modelOfBricks = game.Workspace.spawnwalls
nameOfBricks = "spawnwall"
for i,v in pairs(modelOfBricks:GetChildren()) do
    if v.Name == nameOfBricks then
        v.Transparency = 0 
		v.CanCollide=true
    end
end



function moreplayers()
	print("moreplayers")
	game.Players.PlayerGui.ScreenGui.moreplayers.Visible=true
end

You shouldn't use game.StarterGui when manipulating GUIs, but instead use game.Players.(player name).PlayerGuiinstead, because everything in the StarterGui service is cloned into every player's PlayerGui every time they spawn.