Animation not working when played on player?

How the animation should look: How it looks on a player:

The priority on the animation is action, I don't know what could be interfering

Code on dummy (works fine when i run the game):

local anim = Instance.new("Animation")
anim.AnimationId = "rbxassetid://11262438869"

local a = script.Parent.Humanoid.Animator:LoadAnimation(anim)
a.Looped = true
a:Play()

Code on player in startercharacterscripts (doesn't work lol):

repeat task.wait() until script.Parent
local humanoid: Humanoid = script.Parent:WaitForChild("Humanoid")

local anim = Instance.new("Animation")
anim.AnimationId = "rbxassetid://11262438869"
local track = humanoid.Animator:LoadAnimation(anim)
track.Looped = true

humanoid.Running:Connect(function(s)
	if s > 0 then
		track:Play()
	else
		track:Stop()
	end
end)

Hi, I made an animation system before. Put a script in StarterCharacterScripts. Then insert a folder in the script and rename it to Settings. In the folder place a boolvalue and a number value. Rename boolvalue to Enabled. Rename Numbervalue to Speed. Then insert animation into the script. Rename it to IdleAnimation. Make sure you go to properties tab and put your animation id into it. Here is the script:

--Variables--

local set = script.Settings

local sp = set.Speed

local enabled = set.Enabled

local hum = script.Parent:WaitForChild("Humanoid")

if hum then

	print("Success")

else

	print("No Humanoid")

end

local humanim = hum:LoadAnimation(script:FindFirstChildOfClass("Animation"))



--Playing Animation--

if enabled.Value == true then

	humanim:Play()

	humanim.Looped = true

	humanim:AdjustSpeed(sp.Value)

end 

Hope this helps and you understand. let me know if it doesn't work or you got stuck.