State Machine Hell

Okay so, I came across a nice little fix for my menu and start game problem in my coding. The problem is that I got errors coming from every orifice mostly the top half. This is the template I had: http://gamedevelopment.tutsplus.com/articles/how-to-build-a-jrpg-a-primer-for-game-developers--gamedev-6676

And Unity was loving it for the first few bits. Any tips would help and other than the StateMachine I got it all word for word.

 class StateMachine {
     Map<String, IState> mStates = new Map<String, IState>();
     IState mCurrentState = EmptyState;
     StateMachine gGameMode = new StateMachine();
 
     gGameMode.Add("mainmenu", new MainMenuState(gGameMode));
     gGameMode.Add("openingscrean", new OpeningScreanState(gGameMode));
     gGameMode.Add("localmap", new LocalMap(gGameMode));
 
     gGameMode.Change("openingscrean");
 
     public void Update(float elapsedTime) {
         mCurrentState.Update(elapsedTime);
     }
     public void Update() {
         float elapsedTime = GetElapsedFrameTime();
         gGameMode.Update(elapsedTime);
         gGameMode.Render();
     }
     public void Render() {
         mCurrentState.Render();
     }
     public void Change(String stateName) {
         mCurrentState.OnExit();
         mCurrentState = mStates[stateName];
         mCurrentState.OnEnter();
     }
     public void Add(String name, IState state) {
         mStates[name] = state;
     }
 }