PlayerGui is not a valid member of DataModel Error?

I am having an error at line 1(serverscript): PlayerGui is not a valid member of DataModel.

What I want from the following code is: When a timer hits 0 a GUIis displayed with the winning team.

ServerScript Code:

local policeWinGui = game.PlayerGui.PoliceWinTheGame:WaitForChild("TextLabel")

game.ReplicatedStorage.winnerEvent.OnServerEvent:Connect(function()
    policeWinGui.Visible = true
end)

Here is the local script:

script.Parent.Text = seconds.Value

for i=1, seconds.Value do
    wait(1)
    --decrement by 1
    seconds.Value -= 1
    --Update label
    script.Parent.Text= seconds.Value
    --If time is over
    if seconds.Value <= 0 then
        if not _G.carStollen then
            print("Police Win")
            game.ReplicatedStorage.winnerEvent:FireServer()
        elseif _G.carStollen then
            thivesWinGui.Visible = true
            print("Thives Win")
        end
    end
end