Jetpack not working or functioning, nothing in the output?

Basically, I'm making a jetpack (a quick version) and nothing is happening. I put the tool in game.StarterPack and inserted a Script. There is no part or MeshPart. Here is my code:

function activate()
	local G = game.Players:GetPlayerFromCharacter(script.Parent.Parent)
	G.Character.LowerTorso.Velocity = G.Character.LowerTorso.CFrame.UpVector *100
end

script.Parent.Activated:Connect(activate)

Oh, it doesn't work with tools, but works with a GUI. Got it. Answered the problem myself.