Argument 1 is not missing. but why does it say it is missing?(RemoteEvents)

game.ReplicatedStorage.GetBag.OnServerEvent:Connect(function(player, bag)
&	local a = game.Workspace.Bags:FindFirstChild(bag):Clone()
	a.Parent = player.Character
	a.Handle.Anchored = false
	player.bagName.Value = bag
end)

For some reason it says 'argument 1 missing or nil' in the place where the ampersand(&) is. Can anybody help?

:FindFirstChild takes a string, because it for an instance by its name. local a = game.Workspace.Bags:FindFirstChild(bag.Name):Clone().