Null Reference Exception Error(Solved)

Hey, I am getting "NullReferenceException: Object reference not set to an instance of an object", I dont know what is wrong in my code:

I have a class "EnemyInfo" as

 public class EnemyInfo  {    
 public GameObject enemyObject;     
 }

In another class "Enemies" I am using it like this:

 public class Enemies :  MonoBehaviour  {    

  public static List<GameObject> gos;
  public static List<EnemyInfo> gosN = new List<EnemyInfo>();

  void FixedUpdate() {
  gos = new List<GameObject>(GameObject.FindGameObjectsWithTag("enemy"));
  gosN.Add(new EnemyInfo())  //Solved
  gosN[0].enemyObject = gos[0].gameObject   //here I am getting error, dont know y :S

 }


 }