Ошибка при создании документа xml c

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    [Serializable]
    public class Scene
    {
        public static Scene Load(string file)
        {
            using (Stream loadStream = File.Open(file, FileMode.Open))
            {
                XmlSerializer serializer = new XmlSerializer(typeof(Scene));
                return (Scene)serializer.Deserialize(loadStream);
            }
        }
 
        internal static void Save(string file, Scene obj)
        {
            using (Stream saveStream = File.Open(file, FileMode.Create))
            {
                XmlSerializer serializer = new XmlSerializer(typeof(Scene));
                serializer.Serialize(saveStream, obj);
            }
        }
 
        public void Draw(SpriteBatch spriteBatch)
        {
            foreach (var element in elements)
                element.Draw(spriteBatch);
        }
 
        public List<SceneElement> elements = new List<SceneElement>();
    }
 
    [Serializable]
    [XmlInclude(typeof(SceneElementImage))]
    [XmlInclude(typeof(SceneElementLabel))]
    public abstract class SceneElement
    {
        public int posX;
        public int posY;
        public bool isDrawOriginInCenter;
        public Color color;
        public float rotation;
 
        public abstract void Draw(SpriteBatch spriteBatch);
    }
 
    [Serializable]
    public class SceneElementImage : SceneElement
    {
        public string texture;
        public int targetHeight;
        public int targetWidth;
 
        public override void Draw(SpriteBatch spriteBatch)
        {
            Texture2D ttexture = ContentRegistry.textureRegistry[texture];
            Vector2 origin = Vector2.Zero;
            if (isDrawOriginInCenter)
                origin = new Vector2(targetWidth, targetHeight) / 2.0F;
 
            spriteBatch.Draw(ttexture, new Rectangle(posX, posY, targetWidth, targetHeight), null, color, rotation, origin, SpriteEffects.None, 0);
        }
    }
 
    [Serializable]
    public class SceneElementLabel : SceneElement
    {
        public string text;
        public string font;
 
        public override void Draw(SpriteBatch spriteBatch)
        {
            SpriteFont sFont = ContentRegistry.spriteFontRegistry[font];
            Vector2 origin = Vector2.Zero;
            if (isDrawOriginInCenter)
                origin = sFont.MeasureString(text) / 2.0F;
 
            spriteBatch.DrawString(sFont, text, new Vector2(posX, posY), color, rotation, origin, 1, SpriteEffects.None, 0);
        }
    }

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                Scene s = new Scene();
 
                s.elements.Add(new SceneElementImage());
                s.elements.Add(new SceneElementLabel());
 
                Scene.Save("test.scene", s);
 
                var s2 = Scene.Load("test.scene");

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            SceneElementLabel label = new SceneElementLabel();
            label.text = "Загрузка ...";
            label.posX = 960;
            label.posY = 720;
            label.isDrawOriginInCenter = true;
            label.font = "verdana48";
            label.color = Color.White;
            loadingScene.elements.Add(label);
            Scene.Save("loadingScene.xml", loadingScene);
 
 
            //Где-то ранее
            Scene loadingScene = new Scene();

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[Serializable(), XmlInclude(typeof(SceneElementLabel)), XmlInclude(typeof(SceneElementImage))]
    public class Scene
    {
        public Scene() { }
 
        public static Scene Load(string file)
        {
            Stream loadStream = File.Open(file, FileMode.Open);
            XmlSerializer serializer = new XmlSerializer(typeof(Scene));
            return (Scene)serializer.Deserialize(loadStream);
        }
 
        internal static void Save(string file, Scene obj)
        {
            StreamWriter saveStream = new StreamWriter("scene.xml", false);
            XmlSerializer serializer = new XmlSerializer(typeof(Scene));
            serializer.Serialize(saveStream, obj);
        }
 
        public void Draw(SpriteBatch spriteBatch)
        {
            foreach (var element in elements)
                element.Draw(spriteBatch);
        }
 
        public List<SceneElement> elements = new List<SceneElement>();
    }
 
    [Serializable()]
    public abstract class SceneElement
    {
        public SceneElement() { }
        public int posX;
        public int posY;
        public bool isDrawOriginInCenter;
        public Color color;
        public float rotation;
 
        public abstract void Draw(SpriteBatch spriteBatch);
    }
 
    [Serializable()]
    public class SceneElementImage : SceneElement
    {
        public SceneElementImage() { }
        public string texture;
        public int targetHeight;
        public int targetWidth;
 
        public override void Draw(SpriteBatch spriteBatch)
        {
            Texture2D ttexture = ContentRegistry.textureRegistry[texture];
            Vector2 origin = Vector2.Zero;
            if (isDrawOriginInCenter)
                origin = new Vector2(targetWidth, targetHeight) / 2.0F;
 
            spriteBatch.Draw(ttexture, new Rectangle(posX, posY, targetWidth, targetHeight), null, color, rotation, origin, SpriteEffects.None, 0);
        }
    }
 
    [Serializable()]
    public class SceneElementLabel : SceneElement
    {
        public SceneElementLabel() { }
        public string text;
        public string font;
        
 
        public override void Draw(SpriteBatch spriteBatch)
        {
            SpriteFont sFont = ContentRegistry.spriteFontRegistry[font];
            Vector2 origin = Vector2.Zero;
            if (isDrawOriginInCenter)
                origin = sFont.MeasureString(text) / 2.0F;
 
            spriteBatch.DrawString(sFont, text, new Vector2(posX, posY), color, rotation, origin, 1, SpriteEffects.None, 0);
        }
    }