Datastore not saving values?

I'm trying to make a datastore for a game but it's giving me some trouble. I'm pretty new to datastore, I made this script and have been working on it for a while but I still can't seem to fix it. Any Idea's as to why is not working?

Server Script in ServerScriptService:

local DSS = game:GetService("DataStoreService")
local RepStorage = game:GetService("ReplicatedStorage")
local saveData = RepStorage.saveData
local RedlinePlayerDS = DSS:GetDataStore("RedLineRacing[Datastore]")
local Tutorial = RepStorage.TutorialEvent

SessionData = {}

local PlayerDataTemplate = {
	--["Name"] = {"ValueType"},
	["Rowg Coins"] = {"NumberValue", 15000},
	["Miles Driven"] = {"NumberValue", 0},
	["Rank"] = {"StringValue", "Permit"},
	["Ae86"] = {"BoolValue", false},
	["180SX"] = {"BoolValue", false},
	["1968 Challenger"] = {"BoolValue", false},
	["911"] = {"BoolValue", false},
	["Accord"] = {"BoolValue", false},
	["Camaro SS"] = {"BoolValue", false},
	["Corvette Z06"] = {"BoolValue", false},
	["Huracan Performante"] = {"BoolValue", false},
	["LFA"] = {"BoolValue", false},
	["Lancer Evolution"] = {"BoolValue", false},
	["Miata"] = {"BoolValue", false},
	["ModelS"] = {"BoolValue", false},
	["Senna"] = {"BoolValue", false},
	["Supra"] = {"BoolValue", false}
}

game.Players.PlayerAdded:Connect(function(player)
	--Variables
	local playerKey = "player_"..player.UserId
	local CarStorage = Instance.new("Folder", player)
	CarStorage.Name = "OwnedCars"
	local leaderstats = Instance.new("Folder",player)
	leaderstats.Name = "leaderstats"
	
	--simple generic-for loop to make new value instances:
	for name, object in pairs(PlayerDataTemplate) do
		local newValue = Instance.new(object[1])
		newValue.Name = name
		newValue.Value = object[2]
		
		if object[1] == "NumberValue" or object[1] == "StringValue" then
			newValue.Parent = leaderstats
		else
			newValue.Parent = CarStorage
		end
	end
	
	local GetSave;
	local success, message = pcall(function()
		GetSave = RedlinePlayerDS:GetAsync(playerKey)
	end)
	
	if success then
		--DataStore worked and retrieved something. We continue.
		if GetSave then
			SessionData[playerKey] = GetSave
			for _, object in ipairs(CarStorage:GetChildren()) do
				if object:IsA("BoolValue") then
					print(object.Name, GetSave[object.Name])
					object.Value = GetSave[object.Name]
				end
			end
			for _, object in ipairs(leaderstats:GetChildren()) do
				if object:IsA("StringValue") or object:IsA("NumberValue") then
					print(object.Name, GetSave[object.Name])
					object.Value = GetSave[object.Name]
				end
			end
			print("Data loaded for "..player.Name)
		else
			print("Welcome "..player.Name.." To RedLine Racing!")
			SessionData[playerKey] = {
				["Rowg Coins"] = 15000;
				 ["Miles Driven"] = 0;
				 Rank = "Permit";
				Cars = {
					["Ae86"] = false;
					["180SX"] = false;
					["1968 Challenger"] = false;
					["911"] = false;
					["Accord"] = false;
					["Camaro SS"] = false;
					["Corvette Z06"] = false;
					["Huracan Performante"] = false;
					["LFA"] = false;
					["Lancer Evolution"] = false;
					["Miata"] = false;
					["ModelS"] = false;
					["Senna"] = false;
					["Supra"] = false;
					}
			}
		end
	else
		warn("Can't Load Player Data! Reload Server.")
	end
end)

game.Players.PlayerRemoving:Connect(function(player)
	print(player.Name.." Has Left!")
	local playerKey = "player_"..player.UserId
	local CarStorage = player.OwnedCars
	local leaderstats = player.leaderstats
	local GetSave = RedlinePlayerDS:GetAsync(playerKey)
	
	for _, object in ipairs(CarStorage:GetChildren()) do
				if object:IsA("BoolValue") then
					SessionData[playerKey].Cars.object.Name = object.Value
				end
			end
			for _, object in ipairs(leaderstats:GetChildren()) do
				if object:IsA("StringValue") or object:IsA("NumberValue") then
					SessionData[playerKey].object.Name = object.Value
				end
			end

	local success, message = pcall(function()
		RedlinePlayerDS:SetAsync(playerKey, SessionData[playerKey])
	end)
	
	if success then
		print("saved success for "..player.Name)
	else
		warn("Did not save because: "..message)
	end
end)