parent is a nil value?

script.DoAnim.OnServerEvent:Connect(function(anim,hum)
	script.ReturnEvent:FireAllClients()
	local heck = game.Lighting.PlayAnim:Clone()
	heck.yup.Value = anim
	heck.Parent = hum.Parent.Humanoid
	heck.Disabled = false
end)

error line 5 'attempt to index field "parent"(a nil value)'

Anim is a nil value. Code correction: script.DoAnim.OnServerEvent:Connect(function(plr,anim,hum) You are calling the event as anim being the player calling the event. This leaves hum to be the animation. Adding plr and ignoring it will stop the code error.