getting problem in triggering UI animation throught UI manager with code....

there are no errors but the animation is not playing even i tried to debug code everything is working fine but animations are not played don't know why??? pls help guys..


1. Ui manager Script:-

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class UI_Manager : MonoBehaviour
6. {
7.     #region Singelton
8.     public static UI_Manager instance;
9.  
10.     private void Awake()
11.     {
12.         instance = this;
13.     }
14.     #endregion
15.  
16.     [SerializeField] private Main_Menu mainMenu;
17.     [SerializeField] private Camera dummyCamera;
18.  
19.     public void FixedUpdate()
20.     {
21.         if(Input.GetKey(KeyCode.Space))
22.         {
23.             mainMenu.FadeOut();
24.             Debug.Log("pressed");
25.            
26.         }
27.     }
28.  
29.     public void dummyCameraActivation()
30.     {
31.         dummyCamera.gameObject.SetActive(false);
32.         Debug.Log("done");
33.     }
34. }
35.  

2. Main Menu Script Code

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Main_Menu : MonoBehaviour
6. {
7.     public Animator _mainMenuAnim;
8.     private void OnFadeOutComplete()
9.     {
10.         Debug.LogWarning("FadeOut clip has been ended");
11.     }
12.  
13.     private void OnFadeInComplete()
14.     {
15.         Debug.LogWarning("FadeIn clip has been ended");
16.         UI_Manager.instance.dummyCameraActivation();
17.     }
18.  
19.     public void FadeIn()
20.     {
21.         /*_mainMenuAnimation.Stop();
22.      
23.         _mainMenuAnimation.Play("MainMenuFadeIn");*/
24.     }
25.  
26.     public void FadeOut()
27.     {
28.          UI_Manager.instance.dummyCameraActivation();
29.         _mainMenuAnim.SetTrigger("FadeOut");
30.     }
31.    
32. }
33.  

screenshots are below