OnCollisionEnter2D(...) not called

I want to make a Pong game with Unity, but I can't detect collisions between a ball and a boxCollider. They both have a RigidBody2D component. This is the method : ``` void OncollisionEnter2D (Collision2D collisionInfo) { Debug.Log("Collision"); /*if (collisionInfo.collider.tag == "Player") { Debug.Log("CA MARCHE !"); }*/ } ``` Is Kinematic and IsTrigger are unchecked for each.