Stop is not a valid member of Animation "Animation" Same goes for Play???

This script does so that a anim plays when your walking sideways but the problem is that this happends:

Stop is not a valid member of Animation "Animation" Play is not a valid member of Animation "Animation" Why??

Heres the localscript:

local plr = game.Players.LocalPlayer
local char = plr.Character
local hum = char:WaitForChild("Humanoid")
local UserInputService = game:GetService("UserInputService")

local leftWalk = Instance.new("Animation")
leftWalk.AnimationId = "rbxassetid://6046738829"

local rightWalk = Instance.new("Animation")
rightWalk.AnimationId = "rbxassetid://6046765944"

hum:LoadAnimation(leftWalk)
hum:LoadAnimation(rightWalk)

UserInputService.InputBegan:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.D then
		print("Going Right")
		rightWalk:Play()
	elseif input.KeyCode == Enum.KeyCode.A then
		print("Going Left")
		leftWalk:Play()
	end
end)

UserInputService.InputEnded:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.D then
		print("Animation Stop")
		rightWalk:Stop()
	elseif input.KeyCode == Enum.KeyCode.A then
		print("Animation Stop")
		leftWalk:Stop()
	end
end)

You need to asign :LoadAnimation to a variable. For Example:

leftAnim = hum:LoadAnimation(leftWalk)
rightAnim = hum:LoadAnimation(rightWalk)

After you do this leftAnim:Play() or rightAnim:Stop() will work.