Why are these scripts working in studio, and not in-game?

These scripts is only working in studio. Why?

wait(2)
player = game.Players.LocalPlayer
local cash = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name) --Getting cash value. 

cash.Changed:connect(function()

    --Called when the cash value changes.

    --(when money is added or subtracted)

    game.Workspace.Display.GUI.Amount.Text = "$ "..cash.Value

    --Set the display value.

end)

And this one:

wait(2)
local Msg = "Thank you for playing!"
local Msg2 = "Remember to favorite and thumbs up!"
local Msg3 = "This game is far from done, expect massive improvement!"
player = game.Players.LocalPlayer
cash = game.ServerStorage.PlayerMoney:FindFirstChild(player.Name)
local Msg4 = "You have: $"

while true do
	
  for i = 1, string.len(Msg) do

      script.Parent.Text = string.sub(Msg,1,i) --Since i is always increasing until it gets to its final number, we'll use that as the third argument of string.sub()

      wait(1/10) --We'll wait a tenth of a second before moving on.

  end
wait(3)
  for i = 1, string.len(Msg2) do
	
	script.Parent.Text = string.sub(Msg2,1,i)
	
	wait(1/10)
  end
wait(3)
  for i = 1, string.len(Msg3) do
	 script.Parent.Text = string.sub(Msg3,1,i)
	
	wait(1/10)
  end
wait(3)
script.Parent.Text = ""
wait(1/10)
script.Parent.Text = "Y"
wait(1/10)
script.Parent.Text = "Yo"
wait(1/10)
script.Parent.Text = "You"
wait(1/10)
script.Parent.Text = "You "
wait(1/10)
script.Parent.Text = "You h"
wait(1/10)
script.Parent.Text = "You ha"
wait(1/10)
script.Parent.Text = "You hav"
wait(1/10)
script.Parent.Text = "You have"
wait(1/10)
script.Parent.Text = "You have:"
wait(1/10)
script.Parent.Text = "You have: "
wait(1/10)
script.Parent.Text = "You have: "..cash.Value

  wait(3) --We'll wait three seconds before doing the process over again.

end

Thank you for helping!