How to i fix this animation error?

The animation state SwordAttack could not be played because it couldn't be found! Please attach an animation clip with the name 'SwordAttack' or call this function only for existing animations. UnityEngine.Animation:Play(String, PlayMode) SwordAnimation:Update() (at Assets/SwordAnimation.cs:14)

This is my error, and i try to make a sword attack animation, here is my code: using UnityEngine; using System.Collections;

 public class SwordAnimation : MonoBehaviour {
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         if (Input.GetMouseButtonDown (0)) {
             GetComponent<Animation>().Play("SwordAttack", PlayMode.StopAll);
         }
     }
 }