Humanoid is not a valid Enum Item. Why, and how do I fix this?

I am doing a Kill for XP script and it seems that this code will not work from lines 21 to 26.

local DS = game:GetService("DataStoreService")
local XPStore = DS:GetOrderedDataStore("XP")

game.Players.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder", player)
	leaderstats.Name = "leaderstats"
	
	local XP = Instance.new("IntValue", leaderstats)
	XP.Name = "XP"
	
	pcall(function()
		local XPVal = XPStore:GetAsync(player.UserId)
		if XPVal then
			XP.Value = XPVal
		end
	end)
	
	player.CharacterAdded:Connect(function(Character)
		local humanoid = Character:FindFirstChild("Humanoid")
		if humanoid then
			if humanoid.RigType == Enum.humanoid.HumanoidRigType.R6 then
				local clone = game.ServerStorage:WaitForChild("R6Sword")
				clone.Parent = player.Character
			elseif humanoid.RigType == Enum.humanoid.HumanoidRigType.R15 then
				local clone = game.ServerStorage:WaitForChild("R15Sword")
				clone.Parent = player.Character
		Character.humanoid.Died:Connect(function()
			local tag = Character.Humanoid:FindFirstChild("creator")
			if tag == nil then
				local player = tag.Value
				local XP = 10
				local leaderstats = player:WaitForChild(leaderstats)
				leaderstats.XP.Value = leaderstats.XP.Value + XP
			end
		end)
			end
		end
	end)
end)

game.Players.PlayerRemoving:Connect(function(player)
	pcall(function()
		if player:FindFirstChild("leaderstats") and player.leaderstats:FindFirstChild("XP") and player.leaderstats.XP.Value > 0 then
			XPStore:SetAsync(player.UserId, player.leaderstats.XP.Value)
		end
	end)
end)

I don't know why this happened but I guess. Any help?