Why do I get not found (nil) in this Code?

So recently I asked how to get data, because every single time I try to, it fails, now I guess I will show the code. Inside the main Modulo script I have.

local playerStats = {}


ds=game:GetService("DataStoreService")
local playerData = ds:GetDataStore('PlayerData')
function beginPlayerStats(player)
	player.WaitForDataReady (player);
if(player.DataReady)then
	if(playerData.SetAsync(player.UserId,{power = 0, chakra  = 0, health = 0, level = 0, wind = 0, earth = 0, fire = 0, water = 0}) == nil) then
		playerData.SetAsync(player.UserId,{power = 0, chakra  = 0, health = 0, level = 0, wind = 0, earth = 0, fire = 0, water = 0})
	end
  end
end
function playerStats.returnPlayerStats(player,stat)
	if(player.DataReady) then
		if(playerData.SetAsync(player.UserId,{power = 0, chakra  = 0, health = 0, level = 0, wind = 0, earth = 0, fire = 0, water = 0 }) ~= nil) then
			return playerData.GetAsync(player.UserId,stat)
		end
	end
end
game.Players.ChildAdded:connect(beginPlayerStats);
return playerStats;

inside my non modulo script I have

b = require(game.ServerScriptService.ModuleScript)

game.Players.ChildAdded:connect(function(player)
	player.WaitForDataReady (player );
	 print(player.DataReady);
	
	
print(	b.playerStats.returnPlayerStats(player,"level"));
	print(player);

end)

And i am getting an error in the modulo script stating SetAsync requires an object in the first param which it should not because it should be a key...

It's not .GetAsync nor .SetAsync. When attempting to save data, you must use :GetAsync and :SetAsync