I'm having a problem using tables in datastores, can you help me fix it?

I'm making a shop that uses a module script, here is the script:

local DataStoreService = game:GetService("DataStoreService")
local PlayerAntemDataStore = DataStoreService:GetDataStore("PlayerAnthem")
local OwnedAnthems = DataStoreService:GetDataStore("OwnedPlayerAnthems")

local module = {}

function module:PurchaseAnthem(Player, PlayerAnthemID, Price, AnthemName)
	print("Somthing was clicked.")
	local CurrentId = PlayerAntemDataStore:GetAsync(Player.UserId)
	if (CurrentId ~= PlayerAnthemID) then
		if (Player.leaderstats.Coins.Value >= Price) then
			Player.leaderstats.Coins.Value = Player.leaderstats.Coins.Value - Price
			PlayerAntemDataStore:SetAsync(Player.UserId, PlayerAnthemID)
			local Anthems = OwnedAnthems:GetAsync(Player.UserId)
			print("Got Tabel Async")
			local AnthemTabel = {}
			print("MadeTabel") --The error is right arround here.
			for i, v in pairs(AnthemName) do
				table.insert(AnthemTabel, v)
			end
			print("Edited Tabel")
			OwnedAnthems:SetAsync(AnthemTabel)
			print("SavedTabel")
			local m = Instance.new("Message", Player.PlayerGui)
			m.Text = "Purchace Was Succes!"
			wait(3)
			m:Destroy()
		elseif (Player.leaderstats.Coins.Value < Price) then
			local m = Instance.new("Message", Player.PlayerGui)
			m.Text = "You Do Not Have Enough Coins To Purchace This Player Anthem!"
			wait(3)
			m:Destroy()
		else 
			local m = Instance.new("Message", Player.PlayerGui)
			m.Text = "Unknown Error!"
			wait(3)
			m:Destroy()
		end
	else
		local m = Instance.new("Message", Player.PlayerGui)
		m.Text = "This already is your player anthem!!! (noob)"
		wait(3)
		m:Destroy()
	end
	
end
return module

The script is not working.

I'm getting an error: invalid argument #1 to 'pairs' (table expected, got string)

I think that that means that it is finding a string instead of a table but overall I am really confused. This is the first time I have used tables and I just figured out how to use a data store. Can someone please help me.