Why doesn't this Gui work?

Why doesn't this work?

local i = 1
repeat
	game.StarterGui.Main1.Frame1.Visible = true
	game.StarterGui.Main1.Frame.Visible = true
	game.StarterGui.Main1.TextLabel.Visible = true
	wait(15)
	game.StarterGui.Main1.Frame1.Visible = false
	game.StarterGui.Main1.Frame.Visible = false
	game.StarterGui.Main1.TextLabel.Visible = false
	game.StarterGui.Gamepass.Frame1.Visible = true
	game.StarterGui.Gamepass.Frame.Visible = true
	game.StarterGui.Gamepass.TextLabel.Visible = true
	wait(15)
	game.StarterGui.Gamepass.Frame1.Visible = false
	game.StarterGui.Gamepass.Frame.Visible = false
	game.StarterGui.Gamepass.TextLabel.Visible = false
	game.StarterGui.Credits.Frame1.Visible = true
	game.StarterGui.Credits.Frame.Visible = true
	game.StarterGui.Credits.TextLabel.Visible = true
	wait(15)
	game.StarterGui.Credits.Frame1.Visible = false
	game.StarterGui.Credits.Frame.Visible = false
	game.StarterGui.Credits.TextLabel.Visible = false
until i==2

The reason it is not working is because you have it going into game.StarterGui StarterGui isn't seen by the player, so I would suggest putting this script in StarterGui, and changing the script accordingly. If you want all players to see the same things at the same time this isn't correct

local i = 1
repeat --MAKE SURE THIS SCRIPT IS NOT IN WORKSPACE! IT SHOULD ONLY BE IN STARTERGUI
    script.Parent.Main1.Frame1.Visible = true
    script.Parent.Main1.Frame.Visible = true
    script.Parent.TextLabel.Visible = true
    wait(15)
    script.Parent.Main1.Frame1.Visible = false
    script.Parent.Main1.Frame.Visible = false
    script.Parent.Main1.TextLabel.Visible = false
    script.Parent.Gamepass.Frame1.Visible = true
    script.Parent.Gamepass.Frame.Visible = true
    script.Parent.Gamepass.TextLabel.Visible = true
    wait(15)
    script.Parent.Gamepass.Frame1.Visible = false
    script.Parent.Gamepass.Frame.Visible = false
    script.Parent.Gamepass.TextLabel.Visible = false
    script.Parent.Credits.Frame1.Visible = true
    script.Parent.Credits.Frame.Visible = true
    script.Parent.Credits.TextLabel.Visible = true
    wait(15)
    script.Parent.Credits.Frame1.Visible = false
   script.Parent.Credits.Frame.Visible = false
    script.Parent.Credits.TextLabel.Visible = false
until i==2

Added

while ___ do could also be used to make this more efficient. EXAMPLE:

local i = 1
while true do
    wait(1) --I always forget the wait LOL
    if i == 1 then
    script.Parent.Main1.Frame1.Visible = true
    script.Parent.Main1.Frame.Visible = true
    script.Parent.TextLabel.Visible = true
    wait(15)
    script.Parent.Main1.Frame1.Visible = false
    script.Parent.Main1.Frame.Visible = false
    script.Parent.Main1.TextLabel.Visible = false
    script.Parent.Gamepass.Frame1.Visible = true
    script.Parent.Gamepass.Frame.Visible = true
    script.Parent.Gamepass.TextLabel.Visible = true
    wait(15)
    script.Parent.Gamepass.Frame1.Visible = false
    script.Parent.Gamepass.Frame.Visible = false
    script.Parent.Gamepass.TextLabel.Visible = false
    script.Parent.Credits.Frame1.Visible = true
    script.Parent.Credits.Frame.Visible = true
    script.Parent.Credits.TextLabel.Visible = true
    wait(15)
    script.Parent.Credits.Frame1.Visible = false
   script.Parent.Credits.Frame.Visible = false
    script.Parent.Credits.TextLabel.Visible = false
    else
    print 'i isnt 1'
end
end --May need to add one more "end"

Accept the answer if this helped, please, and remember to be more specific in your questions to get accurate answers

If anyone notices something wrong, let me know please.

THANKS!