Cannot store Array in DataStore?

Ok so i have been working on this script, trying to make it save the children in the Weaps model and then load it into the model when the player enters, everything looks like it would work but when i test it the output says "Cannot store Array in DataStore" or somthing? Can somone tell me what that means and how to fix it?

local datastore = game:GetService("DataStoreService"):GetDataStore("RobloxBackPack")
-------------------------------------------------------------------------

local wm = Instance.new("Model")
wm.Name = "Weaps"

function give(weap, player)

	for _, w in ipairs(game.StarterPack:GetChildren()) do
		if w.Name == weap.Name then return end
	end

	weap:clone().Parent = player.Weaps
end

game.Players.ChildAdded:connect(function(p)
	wm:clone().Parent = p
	wait()
	p.Character.ChildAdded:connect(function(wep)
		if wep.className == "Tool" then
			give(wep, p)
		end
	end)
	p.Changed:connect(function(pr)
		if pr == "Character" then
			for _, w in ipairs(p.Weaps:GetChildren()) do
				w:clone().Parent = p.Backpack
			end
			p.Character.ChildAdded:connect(function(wep)
				if wep.className == "Tool" then
					give(wep, p)
				end
			end)
		end
	end)
	p.Backpack.ChildAdded:connect(function(h)
		if h.className == "HopperBin" then
			give(h, p)		
		end
	end)
end)



game.Players.PlayerAdded:connect(function(player) --Datastore stuff
	local key = "user-" .. player.userId
	local storeditems = datastore:GetAsync(key)
	if storeditems then
		local Special = storeditems[1]
		Special.Parent = player.Weaps
		
	else
		local get = player.Weaps:GetChildren()
		for i, v in pairs(get)do
		local Potato = v:clone()
		local items = {Potato}
		datastore:SetAsync(key, items)
		end
	end
end)


--Says it cannot save a data array?



game.Players.PlayerRemoving:connect(function(player) -- more datastore stuff
	local get = player.Weaps:GetChildren()
	for i, v in pairs(get)do
	local Potato = v:clone()
	
	local items = {Potato}
	local key = "user-" .. player.userId
	
	datastore:SetAsync(key, items)

	end
end)

You are trying to save a model, Potato is a model.