Why does my cloned sword only work on solo mode?

Basically once a player clicks on a button within this LocalGUI they should have a fully working Sword in their backpack, however they only get the ability to hold it, as if the scripts didn't clone over. I don't have this problem with any of the other tools, and I have tried multiple swords, all seem to not work.

SwordButton.MouseButton1Down:connect(function()
		LoadoutFrame:Destroy()
		local Sword = game.ReplicatedStorage.ClassicSword
		local SwordClone = Sword:Clone()
		SwordClone.Parent = game.Players.LocalPlayer.Backpack
		
	end)

Running this through output gave me the message:

Handle is not a valid member of Tool

I have had the same issue, too. I have noticed that cloning in a LocalScript doesn't always go correctly, as LocalScripts on the Client, and normal Scripts run on both the Server and Client. Try the code below in a normal Script inside of the Gui:

Player = script.Parent.Parent.Parent

SwordButton.MouseButton1Click:connect(function()
	LoadoutFrame:remove()
	local Sword = game.ReplicatedStorage:FindFirstChild("ClassicSword")
	if Sword then
		local SwordClone = Sword:Clone()
		SwordClone.Parent = Player.Backpack
	end
end)