I was making a script to store stats but GetChildren in line 20 is invalid, how do I fix this?

local DataStore = game:GetService("DataStoreService")
local GameData = DataStore:GetDataStore("Test 1")

local baseStats =
{
	Health = 10;
	Stamina = 100;
	Speed = 16;
	Strength = 5;
	Agility = 0;
	Gold = 100;
	Level = 1;
	EXP = 0;
	}

function saveData(Player,PlrStats)
	local dataToSave = {}
	
	warn("Saving Data...")
	for i, data in pairs(PlrStats:GetChildren()) do
		dataToSave[i] = data.Value
	end
	
	GameData:SetAsync(Player.UserId,dataToSave)
	warn("Data Saved")
end

game.Players.PlayerAdded:Connect(function(Player)
	local PlrStats = Instance.new("Folder",Player)
	PlrStats.Name = "PlrStats"
	
	local Health = Instance.new("NumberValue",PlrStats)
	Health.Name = "Health"
	Health.Value = baseStats.Health
	
	local Stamina = Instance.new("NumberValue",PlrStats)
	Stamina.Name = "Stamina"
	Stamina.Value = baseStats.Stamina

	local Speed = Instance.new("NumberValue",PlrStats)
	Speed.Name = "Speed"
	Speed.Value = baseStats.Speed

	local Strength = Instance.new("NumberValue",PlrStats)
	Strength.Name = "Strenght"
	Strength.Value = baseStats.Strength

	local Agility = Instance.new("NumberValue",PlrStats)
	Agility.Name = "Agility"
	Agility.Value = baseStats.Agility

	local Gold = Instance.new("NumberValue",PlrStats)
	Gold.Name = "Gold"
	Gold.Value = baseStats.Gold

	local Level = Instance.new("NumberValue",PlrStats)
	Level.Name = "Level"
	Level.Value = baseStats.Level

	local EXP = Instance.new("NumberValue",PlrStats)
	EXP.Name = "EXP"
	EXP.Value = baseStats.EXP

	local plrSaves
	pcall(function()
		plrSaves = GameData:GetAsync(Player.UserId)
	end)
	
	if plrSaves then
		--/If Player has Data
		warn("Player has Data")
		for i, data in pairs(PlrStats:GetChildren()) do
			data.Value = plrSaves[i]
			print(data.Name,":",data.Value)
		end	
		
	else
		--/If Player doesn't have Data
		warn("Player has no Data")
		for i, data in pairs(PlrStats:GetChildren()) do
			print(data.Name,":",data.Value)
		end	
		
	end
	
end)

game.Players.PlayerRemoving:Connect(function(Player)
	local PlrStats = Player:WaitForChild("PlrStats")
	saveData()(Player,PlrStats)
end)