In order to minimize errors we can put our Tags inside a script.
Oper the Project> Script Folder> Create New Js Script

#pragma strict

// A list of tag strings.
public static var player : String = "Player";
public static var alarm : String = "AlarmLight";
public static var siren : String = "Siren";
public static var gameController : String = "GameController";
public static var mainLight : String = "MainLight";
public static var fader : String = "Fader";
public static var enemy : String = "Enemy";