"Onee is not a valid member of ScreenGui" even though it is. Help?

https://gyazo.com/3c0d7b6e19d11dc394561fe5aae3d8ca

Everytime I start the game, it give the error "Onee is not a valid member of ScreenGui"

Even though it is in there. Here are the scripts.

game.Players.PlayerAdded:connect(function(plr)
    s = game.ServerStorage.ScreenGui:Clone()
    s.Parent = plr.PlayerGui

    while true do
        wait(0.01)
plr.PlayerGui.ScreenGui.TextLabel.Text = game.ReplicatedStorage.One.Value       
    end
    end)

2nd:

game.ReplicatedStorage.RemoteEvent.OnServerEvent:connect(function()
        game.ReplicatedStorage.One.Value = game.ReplicatedStorage.One.Value + 1
    print(game.ReplicatedStorage.One.Value)

    if game.ReplicatedStorage.One.Value == 2 then
    game.Workspace.Part.BrickColor = BrickColor.new("Black")
    end

end)

3rd: Local Script

a = 0
script.Parent.Onee.MouseButton1Click:connect(function()
    if a < 1 then
        a = 1
        game.ReplicatedStorage.One.Value = game.ReplicatedStorage.One.Value + 1
    print(game.ReplicatedStorage.One.Value)
    game.ReplicatedStorage.RemoteEvent:FireServer()
    end


end)