how to save a string value with Data Persistance ?[SOLVED]

Script in workspace

function loada(player)
	if player.DataReady then 
		if player then
			wait()
			local score = player.Folder:GetChildren()
			for i = 1,#score do
				
					local ScoreLoaded = player:LoadNumber(score[i].Name)
					local ScoreLoaded2 = player:LoadString("DF")
					wait()
					if score[i].Name == "DF" then
						player.Folder.DF.Value = ScoreLoaded2
					end
					if ScoreLoaded ~= 0 then
						score[i].Value = ScoreLoaded
					else
					
					end
				end
			
			----Load Inventory----
			local inventory = player:findFirstChild("Inventory")
			if inventory then
				local saved_inv = player:LoadInstance("Invent")
				if saved_inv then
					for j,k in pairs(saved_inv:GetChildren()) do
						k.Parent = inventory
					end
				end
			end
			end
	end
	end
function onPlayerEntered(player)
	local Inventory = Instance.new("Folder")
	Inventory.Name = "Inventory"
	Inventory.Parent = player

	local leaderboard = Instance.new("Folder")
	leaderboard.Name = "Folder"
	leaderboard.Parent = player
	
	local Beli = Instance.new("IntValue")
	Beli.Value = 10
	Beli.Name = "Beli"
	Beli.Parent = leaderboard

	local Trys = Instance.new("IntValue")
	Trys.Value = 2
	Trys.Name = "Trys"
	Trys.Parent = leaderboard

	local DF = Instance.new("StringValue")
	DF.Name = "DF"
	DF.Parent = leaderboard

	local GotDF = Instance.new("IntValue")
	GotDF.Value = 0
	GotDF.Name = "GotDF"
	GotDF.Parent = leaderboard

	local SetDF = Instance.new("IntValue")
	SetDF.Value = 0
	SetDF.Name = "SetDF"
	SetDF.Parent = leaderboard

	local Scene = Instance.new("IntValue")
	Scene.Value = 1
	Scene.Name = "Scene"
	Scene.Parent = leaderboard



	player:WaitForDataReady()
	loada(player)
	wait()
end

function onPlayerLeaving(player)
end

game.Players.PlayerAdded:connect(onPlayerEntered)
game.Players.PlayerRemoving:connect(onPlayerLeaving)

script in startergui

player = script.Parent.Parent.Parent
function save()
	if player.DataReady then
		if player then
			local score = player.Folder:GetChildren()
			for i = 1,#score do
				if score[i].ClassName == "IntValue" then
						player:SaveNumber(score[i].Name,score[i].Value)
						if score[i].Name == "DF" then
						player:SaveString(score[i].Name,score[i].Value)
						end
				end
				end
			if pcall(function()  player:SaveInstance("Invent", player.Inventory)  end) then
				script.Parent.Inventory.Button.Text = "Saved!"
				wait(1)
				script.Parent.Inventory.Button.Text = "Save"
			end
		end

	end
end
script.Parent.Inventory.Button.MouseButton1Click:connect(save)

while true do
	wait(300)
	save()
end