NullReferenceException: Object reference not set to an instance of an object

Questions & Answers
1

I get this error when playing the game and the class doesn’t work. These are my codes:
Ball.cs

using UnityEngine;
using System.Collections;

public class Ball : MonoBehaviour {

public float maxVelocity = 20;
public float minVelocity = 15;

void Awake () {
    rigidbody.velocity = new Vector3(0, 0, -18);
	rigidbody.AddForce (1, 0, 1);
}

void Update () {
    //Make sure we stay between the MAX and MIN speed.
    float totalVelocity = Vector3.Magnitude(rigidbody.velocity);
    if(totalVelocity>maxVelocity){
        float tooHard = totalVelocity / maxVelocity;
        rigidbody.velocity /= tooHard;
    }
    else if (totalVelocity < minVelocity)
    {
        float tooSlowRate = totalVelocity / minVelocity;
        rigidbody.velocity /= tooSlowRate;
    }

    //Is the ball below -3? Then we're game over.
    if(transform.position.z <= -6){            
        BreakOut.SP.LoseGame();
       
    }
}

}

Block1.cs

using UnityEngine;
using System.Collections;
public class Block1 : MonoBehaviour {

	void OnCollisionExit(Collision collisionInfo)
	{
		if (collisionInfo.gameObject.name == "BallPrefab")
		{
			Destroy(gameObject);
			BreakOut.SP.HitBlock ();
		}
	}
}

These are error message:

  • NullReferenceException: Object
    reference not set to an instance of
    an object Block1.OnCollisionExit
    (UnityEngine.Collision collisionInfo)
    (at Assets/AAAAAA/Block1.cs:10)

  • NullReferenceException: Object
    reference not set to an instance of
    an object Block1.OnCollisionExit
    (UnityEngine.Collision collisionInfo)
    (at Assets/AAAAAA/Block1.cs:10)

  • NullReferenceException: Object
    reference not set to an instance of
    an object Ball.Update () (at
    Assets/AAAAAA/Ball.cs:29)

I know there are similar question but I can’t understand much becuase their situation doesn’t look like mine. I am a begginer and not good at English so please answer simply and the way to fix it. Thank you very muc

2

Errors are pretty clear. You have a problem with the BreakOut element. Check that out.