DataStore will not save the items in my table, what did I do wrong?

So I'm working on a skin shop in my game. But for some reason my Data Store will not save my table that I've created with the object models of the skins. Here's my error message

DataStore Error: 35: invalid argument #1 to 'pairs' (table expected, got string)

local dataStoreService = game:GetService("DataStoreService")
local TokensDataStore = dataStoreService:GetDataStore("Tokens")
local WinsDataStore = dataStoreService:GetDataStore("Wins")
local InventoryDataStore = dataStoreService:GetDataStore("Inventory")
local http = game:GetService("HttpService")
game.Players.PlayerAdded:Connect(function(plr)
	local leaderstats = Instance.new("Folder",plr)
	leaderstats.Name = "leaderstats"
	local Wins = Instance.new("IntValue",leaderstats)
	Wins.Name = "Wins"
	local Tokens = Instance.new("IntValue",leaderstats)
	Tokens.Name = "Tokens"
	local Plr = Instance.new("Folder",game.ServerStorage:WaitForChild("PlayerInventory"))
	Plr.Name = plr.Name
	
	local WinsData
	local TokensData
	local InventoryData
	
	local success,errormessage = pcall(function()
		WinsData = WinsDataStore:GetAsync(plr.UserId.."-Wins")
		TokensData = TokensDataStore:GetAsync(plr.UserId.."-Tokens")
		InventoryData = InventoryDataStore:GetAsync(plr.UserId.."-Inventory")
	end)
	if success then
		Tokens.Value = TokensData
		print(TokensData)
		Wins.Value = WinsData
		print(WinsData)
		
		
		if InventoryData then
			print(InventoryData)
			print(tostring(InventoryData))
			for i,skin in pairs(http:JSONDecode(tostring(InventoryData))) do
				print(skin.Name..": hi")
				local playerInventory = game.ServerStorage:WaitForChild("PlayerInventory")
			end
		end
		print("Loaded data.")
	else
		warn("DataStore error: ",errormessage)
	end
end)

game.ReplicatedStorage.events.ServerTokenUI.OnServerEvent:Connect(function(plr)
	local tokens = plr.leaderstats.Tokens
	game.ReplicatedStorage.events.ClientTokenUI:FireClient(plr,tokens)
end)

local bindableEvent = Instance.new("BindableEvent")
game.Players.PlayerRemoving:Connect(function(plr)
	local success,errormessage = pcall(function()
		WinsDataStore:SetAsync(plr.UserId.."-Wins",plr.leaderstats.Wins.Value)
		TokensDataStore:SetAsync(plr.UserId.."-Tokens",plr.leaderstats.Tokens.Value)
		local skins = {}
		local inventory = game.ServerStorage.PlayerInventory[plr.Name]
		for _,skin in pairs(game.ServerStorage:WaitForChild("Skins"):GetChildren()) do
			if inventory:FindFirstChild(skin.Name) then
				table.insert(skins,skin)
				print("Added: "..skin.Name)
			end
			print(skin)
		end
		InventoryDataStore:SetAsync(plr.UserId.."-Inventory",http:JSONEncode(skins))
		
		if #game.Players:GetPlayers() <= 1 then
			bindableEvent:Fire()
		end
	end)
	if success then
		print("Saved data.")
	else
		warn("DataStore Error: ",errormessage)
	end
end)
game:BindToClose(function()
	bindableEvent.Event:Wait()
end)