How do I clone the children of a folder?

Okay, so I am making a game. This game involves classes, and I have it set so when somebody chooses for an item to go into a certain class, those items are cloned to a folder inside that player (game.Players.LocalPlayer). But then when they go to play the game, the items are not being cloned into the player's backpack and I receive the following error; Players.Player1.PlayerGui.Play.TextButton.LocalScript:5: attempt to call method 'Clone' (a nil value) Here is my code;

local ClassOne = game.Players.LocalPlayer:WaitForChild("ClassOne")

script.Parent.MouseButton1Click:connect(function()
	local GetItems = ClassOne:GetChildren()  -- I need help here,
	GetItems:Clone().Parent = game.Players.LocalPlayer.Backpack -- and here.
end)

Any help would go a long way, and is always appreciated. Thanks.

local player = game.Players.LocalPlayer
local ClassOne = player:WaitForChild("ClassOne")

script.Parent.MouseButton1Click:connect(function()
	if ClassOne then
		local GetItems = ClassOne:GetChildren()
		for i,v in pairs(GetItems) do --i = index, v = value; it loops through the children of ClassOne and for every item it clones it into the players backpack
			local clone = v:Clone()
			clone.Parent = player.Backpack
		end
	end
end)

Hope I helped!