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namespace xyz
{
    public partial class Game1 : Game
    {
  //Variablendeklaration...

        protected GraphicsDeviceManager graphics;
        protected SpriteBatch spriteBatch;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        protected override void LoadContent()
        {         
            Video video = Content.Load<Video>("Intro");
            videoPlayer.Play(video);
            GameMode = GameMode.None;
            font = Content.Load<SpriteFont>("Courier New");
            spriteBatch = new SpriteBatch(GraphicsDevice);
            player.Texture = Content.Load<Texture2D>("breaker");
            player.Speed = SCREENWIDTH / 10;
            Menu.Load();
            GameState = GameState.Loaded;
        }
    }
}                    

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namespace xyz
{
    public class Menu : Game1
    {        

  //...
  public void Load()
        {
            StringStartPosition = WINDOW.Height / 5;
            StringDistance = WINDOW.Height / 10;
            Font = Content.Load<SpriteFont>("MenuFont"); //Hier tritt die Exception auf
            Strings.Add(new SelectableString("You vs the Clock", Font, "Reach the goal as fast as you can. The clock is ticking!"));
            Strings.Add(new SelectableString("Apocalyptic Mode", Font, "Reach the goal as fast as you can. You have weapons and other usefull things. Use them! The clock is ticking!"));
            Strings.Add(new SelectableString("Create Map", Font, "Create your own maps and play them."));
            Strings.Add(new SelectableString("Options", Font, "Change the settings of the game"));
            Strings.Add(new SelectableString("Exit", Font, "Leave the game. Are you sure?"));
            Background = Content.Load<Texture2D>("Menu");
            Color = Set.MenuColor;
            SelectionColor = Set.MenuSelectedColor;
            Strings[0].Select = true;
            SelectedString = 0;
            InfoText = Strings[0].TextInfo;
        }
  //...
    }
}