the full script is:

wait(0.5)

Ui = script.parent
game.Players.PlayerAdded:Connect(function(Player)
	Player.CharacterAdded:Connect(function(Character)
		local Torso = Character.UpperTorso
		local weld = Instance.new('Weld', Ui)
		weld.Parent = Ui
		weld.Part0 = Ui
		weld.Part1 = Torso
		weld.C0 = CFrame.new(0,2,0)
		weld.C1 = CFrame.new(0,0,1)
	end)
end)

(this script is inside a brick inside workspace)

what i am trying to do is: the player joins the game the a part just welds the the uppertorso(R15)

if you need any more information just comment ill add it as fast as i can