Unable to cast value to object Humanoid:LoadAnimation()?

alright oso im trynna load a animation to my avatar and whenever i run this script it says unable to cast value to an object

game.Workspace.Slixicidal.Humanoid:LoadAnimation(2917553081)

i tried it with rbxasset but it didnt work

You can't load an animation by it's robloxid.

You should first create the animation, then replace the id to the animation instance.

local Animation = Instance.new("Animation")
Animation.AnimationId = "rbxassetid://291755308"

local Human = game.Workspace:FindFirstChild("Slixicidal")

if Human then
   local Humanoid = Human.Humanoid
   local AnimationTrack = Humanoid:LoadAnimation(Animation)
   AnimationTrack:Play()
end

Hope this helps !