System.NullReferenceException: Object reference not set to an instance of an object.
at Engine.ListManager.GoodsListManager.UsingGood(Int32 goodIndex) in D:\src\newsword-linux\Project1\ListManager\GoodsListManager.cs:line 734
at Engine.Player.HandleKeyboardInput() in D:\src\newsword-linux\Project1\Player.cs:line 321
at Engine.Player.Update(GameTime gameTime) in D:\src\newsword-linux\Project1\Player.cs:line 1255
at Engine.JxqyGame.UpdatePlaying(GameTime gameTime) in D:\src\newsword-linux\Project1\JxqyGame.cs:line 420
at Engine.JxqyGame.Update(GameTime gameTime) in D:\src\newsword-linux\Project1\JxqyGame.cs:line 227