Need Help With a Script That Opens a Gui When Countdown Finishes?

OK So on line 69 I am having a problem with calling the Gui fro StarterGui. No matter what I do it will not make the Gui appear when the countdown is over.

Currently on line 69 I have game.StarterGui.Waves.Waves.Enabled = true I have also tried game.StarterGui.Waves.Waves.Frame.Visible = true amongst other calls to try to get it to show up.

I am thinking this is because it is not pointing toward the PlayerGui and instead is pointing to the Gui located in the StarterGui, However I have no idea how I to point it to a player without it being a local script. Can soeone help me revise this so it will show the Gui in this server script. Thanks in advance, any help is appreciated

game.ServerScriptService["Wave1 - PathFind"].ZombieScript.Disabled = false
game.ServerScriptService["Wave1 - PathFind"].ZombieScript1.Disabled = false
game.ServerScriptService["Wave1 - PathFind"].ZombieScript1d3.Disabled = false

disasters = {"Wave0"} -- This is where you list the names models that you want to use for disasters.
-- Disaster names are case-sensitive and all disaster models must be in the lighting

countdownTime = 5 -- The ammount of time to wait between each disaster.

countdownMessage = "You have %s to prepare." -- The message displayed between disasters. %s will be replaced with the number of seconds left.
disasterMessage = "Wave 1" -- The message displayed when a disaster occurs. %s will be replaced with the disaster name. Set to nil if you do not want a message

-- Unless you know what you are doing, please leave the below code alone.
items = {}
local w = game.Workspace:getChildren()



for i=1, #disasters do
    local item = game.ReplicatedStorage.Wave1: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[1]
end

function sethint(text)
    local hint = game.Workspace:findFirstChild("hint")
    if (hint ~= nil) then
        hint.Text = text
    else
        print("Hint does not exist, creating...")
        local h = Instance.new("Hint")
        h.Name = "hint"
        h.Text = text
        h.Parent = game.Workspace
    end
    --print("Hint set to: ", text)
end

function removeHint()
    local hint = game.Workspace:findFirstChild("hint")
    if (hint ~= nil) then hint:remove() 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
    removeHint()
    return true
end

while true do
    countdown(countdownTime)

    local m = chooseDisaster():clone()
print("This is working")

 game.StarterGui.Waves.Waves.Enabled = true

print("This is working 2")

        wait(3)
        print("This is working 3")


    local m = chooseDisaster():clone()
    m.Parent = game.Workspace
    m:makeJoints()





break
end