Error CS0117

"Assets/Standard Assets/Scripts/Targetting.cs(19,46): error CS0117: UnityEngine.GameObject' does not contain a definition for FindGameObjectsWhitTag'"

Need help with that error.

My code:

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using UnityEngine; using System.Collections; using System.Collections.Generic;

public class Targetting : MonoBehaviour { public List targets;

 // Use this for initialization
 void Start () {
     targets = new List();
     
     AddAllEnemies(); 
 }
 
 public void AddAllEnemies() 
 {
     GameObject[] go = GameObject.FindGameObjectsWhitTag("Enemy");
     
     foreach(GameObject enemy in go)
         AddTarget(enemy.transform);
 }    
 
 public void AddTarget(Transform enemy)
 {
     targets.Ass(enemy);
 }    
     
 
 
 // Update is called once per frame
 void Update () {
 
 }

}