Save/Load script with FilteringEneabled active don't work. why?

I have a save/load script, the problem i have is, if i have FE disabled the script works, but when i actívate it to make local parts it don't work. The script is inside the server script service and is a script not a local script. Someone know how to fix this?

wait()

local player = script.Parent.Parent.Parent.Parent

local savebutton = script.Parent.Save
local loadbutton = script.Parent.Load

local notifysave = savebutton.Notify
local notifyload = loadbutton.Notify

local saveDB = false
savebutton.MouseButton1Up:connect(function()
	if saveDB then return end
	saveDB = true
	notifysave.Text = "  Saving..."
	notifysave.Visible = true
	local cpnum = player:FindFirstChild("CheckPointNumber")
	if cpnum ~= nil then
		if cpnum.Value == 0 or cpnum.Value == 1 then
			notifysave.Text = "  Refused save request"
		else
			player:WaitForDataReady()
			player:SaveNumber("CheckPoint", cpnum.Value)
			wait(1)
			notifysave.Text = "  Saved Data!"
		end
	else
		notifysave.Text = "  Stat unavailable!"
	end
	wait(1.5)
	notifysave.Text = ""
	notifysave.Visible = false
	saveDB = false
end)

local loadDB = false
loadbutton.MouseButton1Up:connect(function()
	if loadDB then return end
	loadDB = true
	notifyload.Text = "  Loading..."
	notifyload.Visible = true
	local cpnum = player:FindFirstChild("CheckPointNumber")
	if cpnum ~= nil then
		player:WaitForDataReady()
		local cpnumber = player:LoadNumber("CheckPoint")
		if cpnumber == nil or cpnumber == 0 then
			wait(1)
			notifyload.Text = "  Could not load data!"
		else
			cpnum.Value = cpnumber
			wait(1)
			notifyload.Text = "  Loaded Data!"
		end
	else
		notifyload.Text = "  Stat unavailable!"
	end
	wait(1.5)
	notifyload.Text = ""
	notifyload.Visible = false
	loadDB = false
end)