Other People Not Seeing Custom Animations?

I'm making a game, and there are seats in cars which have custom animations, and when testing my game with friends they can't seem to see the animation, just me standing up.

I need to somehow fix this issue, any help?

---SCRIPT---

local seat = script.Parent
local lastOc 


seat.Changed:Connect(function(prop)
	if prop == "Occupant" then
		if seat.Occupant then
			local oc = seat.Occupant
			local anim = script.Parent.Animation.AnimationId
			oc.Parent.Animate.sit.SitAnim.AnimationId = anim
			lastOc = oc
		end
		if not seat.Occupant then
			if lastOc then
				lastOc.Parent.Animate.sit.SitAnim.AnimationId = "http://www.roblox.com/asset/?id=6315866907"
			end
		end
	end
end)

(If this is a problem, the animations are owned by me but the game is owned by my group, is that a problem?)