Save/load system not changing text of GUI?

I'm trying to make a Save/load system. When I play my game and press "Save" it doesn't even change the text of the GUI, I've checked the output and it says nothing. It's not a localscript. When I play in roblox studio it changes the text.

local Debounce = false
local player = script.Parent.Parent.Parent.Parent
local Save = script.Parent.Save
local Load = script.Parent.Load

Save.MouseButton1Click:connect(function()
	if Debounce == false then
		Debounce = true
		Save.Text = "Saving..."
		player:WaitForDataReady()
		player:SaveBoolean("Sphere1",player.Sphere1.Value)
		Save.Text = "Saved!"
		wait(1)
		Save.Text = "Save"
		Debounce = false
	end
end)

Load.MouseButton1Click:connect(function()
	if Debounce == false then
		Debounce = true
		Load.Text = "Loading..."
		player:WaitForDataReady()
		player.Sphere1.Value = player:LoadBoolean("Sphere1")
		if player.LoadBoolean("Sphere1") == true then
			--has 1 sphere
		end
		Load.Text = "Loaded!"
		wait(1)
		Load.Text = "Load"
		Debounce = false
	end
end)

Your issue is probably that you attempt to acces the save and load button before they're replicated to the Client (The player)

To fix this simpfully add

local Save = script.Parent:WaitForChild("Save")
local Load = script.Parent:WaitForChild("Load")