I can't access my player's Humanoid?

I'm trying to animate a tool in my player's starterpack, but for some reason I keep getting an error message that says "attempt to index field 'Character' (a nil value)" referring to line 3. I've tried several variations where I make the script wait for everything to load, but none of those worked either.

This is the code:

tool = script.Parent
local animation = tool.SwingAnimation
humanoid = game.Players.LocalPlayer.Character.Humanoid
local track = humanoid:LoadAnimation(animation) --loads the animation into humanoid

tool.Activated:Connect(function()
	track:Play()
	wait(1)
end)

tool.Deactivated:Connect(function()
	track:Stop()
end)

What am I doing wrong? Thanks!