Why cant this script index its own parent?

server script:

f = false
script.Parent.MouseButton1Click:Connect(function()
	if not f then
		f = true
	for i,v in pairs(game.Workspace:GetChildren()) do
		if v.Name:match(script.Parent.Parent.Parent.Parent.Parent.Name) then
			local player = game.Players:GetPlayerFromCharacter(v)
			if player.leaderstats.Money.Value >= 15 then
			player.leaderstats.Money.Value = player.leaderstats.Money.Value - 15
			script.Parent.Parent:Destroy()
			end
			end
		end
	end
end)

on line 6 it says

Players.world_kiIIer.PlayerGui.rank.Frame.yes.yes:6: attempt to index field 'Parent' (a nil value)

why does this happen?

Double check your parent directory, the only feasible error is that you're using too many .Parent addresses, and you eventually called for the parent of the game, which is nil.