anchor.diff:          stateContext.game.resourceManager.getBitmapData(resourceName), 
           isMovable: isMovable, addToStage: addToStage, 
           repeatMode: repeatMode, scaleMode: scaleMode
  -      );
  +    );
   
     /**
      * Create a Background object from an image, which is inside a texture atlas(JSON).
  
positive.code:       this.addToStage();
      }
    }
  
    /**
     * Create a Background object from an image.
  
negative.code:       stateContext.game.resourceManager.getTextureAtlas(textureAtlasName)
          .getBitmapData(resourceName), 
        isMovable: isMovable, addToStage: addToStage, 
        repeatMode: repeatMode, scaleMode: scaleMode
      );
  
    addToStage() {
      _backgroundTileList.forEach((tile) {
  