Animation Stopped() Event Broken?

I'm using the Animation's Stopped() event to change a Value of a Variable. But, is it broken or I don't know how to use it? Here's my code :

local closeanim = script.AnimationEnd
local debounce = false

closeanim.Stopped:connect(function()
    debounce = true
end)

here's the error i get

18:14:14.716 - Stopped is not a valid member of Animation

The animation was played in a different script, don't know if this caused it