Running Animation via Key Press, getting error?

Okay, so I'm trying to make a crouching script that uses a crouching animation instead of the old c-frame method. The animation (CrouchAnim in the script) is a Child of the Script. Whenever I run it, however, it comes up with the below error. Tbh I'm not even understanding how the Humanoid could be considered not a descendant of the game in this way. Anyone know how to fix this?

The intended result is for the animation to be run by pressing a keyboard button (C in this case). The animation should run, making the character crouch.

*The script is in StarterPack btw.

The Error is:

16:00:57.902 - LoadAnimation requires the Humanoid object (Player1.Humanoid) to be a descendant of the game object 16:00:57.903 - Stack Begin 16:00:57.903 - Script 'Players.Player1.Backpack.Crouch', Line 3 16:00:57.904 - Stack End

Script (error is at Line 3):

local Humanoid = game.Players.LocalPlayer.Character.Humanoid
local Animation = script.CrouchAnim
local Current = Humanoid:LoadAnimation(Animation)
crouching=false
------------------------------------------------------

function onKeyDown(key,mouse)
	key=key:lower()
	if key=="c" then
	if crouching==false then
		crouching=true
Current:Play()
	elseif crouching~=false then
		crouching=false
Current:Stop()

	end
end
end

If you could PM me (Voikov), that'd be great. Thanks.

Maybe it's because the character hasn't loaded yet, and isn't a descendant of the game object yet? Try this on a server test. But yeah, if it is that the character hasn't loaded yet, try this:

game.Players.LocalPlayer.CharacterAdded:connect(function()
	local Humanoid = game.Players.LocalPlayer.Character.Humanoid
	local Animation = script.CrouchAnim
	local Current = Humanoid:LoadAnimation(Animation)
	crouching=false

	function onKeyDown(key,mouse)
    		key=key:lower()
    		if key=="c" then
    			if crouching==false then
        			crouching=true
				Current:Play()
    			elseif crouching~=false then
       			 	crouching=false
				Current:Stop()
end
end
end
end)