why my script Give me Local player error?

I'm trying to make an npc activate a script that is in game.players.LocalPlayer.PlayerGui.GuiName but this give me error attempt to index field 'LocalPlayer' (a nil value)

script:

script.Parent.NPCTalk.OnServerEvent:connect(function(player) local plrGui = game.Players.LocalPlayer.PlayerGui plrGui.Talk.Disabled = false end)