no instance of constructor matches the argument list

Here is the constructor

Bullet(sf::Vector2f& startPos, float angle, float speed, float lifeTime, std::string fileName, b2World& world)

And my argument list

//How each variable is defined
sf::Sprite sprite; // returns a const Vector2f &
float desired Angle = ...;
b2World* world = ...;



Bullet* newBullet = new Bullet(sprite.getPosition(), desiredAngle, 3.0f, 1.0f, "bullet.png", world); 

I dont understand how this is wrong. I do have an inkling it might have to do with the b2World* world, however.