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Object reference not set to an instance of an object.

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I am getting the error "Object reference not set to an instance of an object." when I'm trying to run my XNA game. I'm basicly trying to sort-of make an engine so I load in textures using a class and manage all the sprites with another class.

Here's my code:

ContentManager contentManager;

Sprite character;
SpriteManager spriteManager;

public Game()
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";

protected override void Initialize()
character = new Sprite();
spriteManager = new SpriteManager();


protected override void LoadContent()
character.setTexture(spriteManager.loadTexture(contentManager, "CharSprite"));
character.setPosition(new Vector2(50, 50));

spriteBatch = new SpriteBatch(GraphicsDevice);


private Texture2D texture;

public void setTexture(Texture2D spriteTexture)
texture = spriteTexture;


private Texture2D loadedTexture;

public Texture2D loadTexture(ContentManager cm, string asset)
loadedTexture = cm.Load<Texture2D>(asset);
return loadedTexture;

(This is a simplified version so you don't have to look through 150 lines of code)

What am I doing wrong?

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