Play Animation on Click c# Unity 5.2

 using UnityEngine;
 using System.Collections;
 
 public class Shoot : MonoBehaviour {
     public GameObject bullet;
     public float delayTime = 8;
 
     private float counter = 0;
 
     // Use this for initialization
     void Start () {
 
     }
     
     // Update is called once per frame
     void FixedUpdate () {
         if(Input.GetKeyDown(KeyCode.Mouse0) && counter > delayTime)
         {
             Instantiate(bullet, transform.position, transform.rotation);
             counter = 0;
             
         }
         counter += Time.deltaTime; 
     }
 }
 

That is my code for my gun shooting. The script is connected to an Empty that produces the bullet on click. I want to be able to play the animation of the gun only once on key press, but I have no clue on how to do it now.

I have tried following this as it seems the most simplse: http://answers.unity3d.com/questions/165833/play-animation-on-button-press.html

The problem arises when I get the error of CS0619 when I try putting animation.Play("shooting");

I appreciate any help and advice as I have little to no experience in coding and is just following tutorials online.