Object reference not set to an instance of an object.
   at DungeonCrawler.NetworkGameManagerComponent.SpawnPlayersArena()
   at DungeonCrawler.NetworkControllerComponent.networkSession_GameStarted(Object sender, EventArgs e)
   at DungeonCrawler.CustomNetworkSession.StartGame()
   at DungeonCrawler.FullScreenArenaLobbyOverlay.StartCrawlGame()
   at DungeonCrawler.FullScreenArenaLobbyOverlay.startGameMouseButton_MouseLeftClick(Object sender, PlayerIndex player)
   at DungeonCrawler.UIMouseBox.TriggerMouseClick(PlayerIndex player)
   at DungeonCrawler.UIHelper.HandleMousing(List`1 baseElements, Rectangle bounds, Viewport viewPort, PlayerInputState input)
   at DungeonCrawler.FullScreenArenaLobbyOverlay.UpdateLobbyExpanded()
   at DungeonCrawler.FullScreenArenaLobbyOverlay.Update(GameTime gameTime)
   at DungeonCrawler.FullscreenOverlayControllerComponent.Update(GameTime gameTime)
   at Microsoft.Xna.Framework.Game.Update(GameTime gameTime)
   at DungeonCrawler.DungeonCrawlerGame.Update(GameTime gameTime)
   at Microsoft.Xna.Framework.Game.Tick()
   at Microsoft.Xna.Framework.Game.HostIdle(Object sender, EventArgs e)
   at Microsoft.Xna.Framework.GameHost.OnIdle()
   at Microsoft.Xna.Framework.WindowsGameHost.RunOneFrame()
   at Microsoft.Xna.Framework.WindowsGameHost.ApplicationIdle(Object sender, EventArgs e)
   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Microsoft.Xna.Framework.WindowsGameHost.Run()
   at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
   at DungeonCrawler.Program.Main(String[] args)