Question NullReferenceException

Hello, I am trying to make the camera zoom out while travelling in trigger but only getting NullReferenceExceptions. I'm not sure what the problem is

Code (CSharp):

1. using UnityEngine;
2. using Cinemachine;
3.  
4. public class OnTriggerZoomWalk : MonoBehaviour
5. {
6.     [SerializeField] CinemachineVirtualCamera vcam;
7.  
8.     private float startPos, startSize, newsize;
9.     public float zoomOutMax, zoomStrength;
10.     void Start()
11.     {
12.         vcam = GetComponent<CinemachineVirtualCamera>();
13.     }
14.  
15.     private void OnTriggerEnter2D(Collider2D other) {
16.         if(other.CompareTag("ZoomOutWalk"))
17.         {
18.             startPos = transform.position.x;
19.             startSize = vcam.m_Lens.OrthographicSize;
20.         }
21.     }
22.  
23.     private void OnTriggerStay2D(Collider2D other)
24.     {
25.         if(other.CompareTag("ZoomOutWalk"))
26.         {
27.  
28.             float currentSize = vcam.m_Lens.OrthographicSize;
29.             newsize = (startPos - transform.position.x) * zoomStrength;
30.             newsize = currentSize + newsize;
31.             if(currentSize <= newsize && newsize <= zoomOutMax)
32.             {
33.                 vcam.m_Lens.OrthographicSize = newsize;
34.             }
35.         }
36.        
37.     }
38.  
39.     private void OnTriggerExit2D(Collider2D other)
40.     {
41.         vcam.m_Lens.OrthographicSize = startSize;
42.     }
43.  
44. }
45.  

error messages;
NullReferenceException: Object reference not set to an instance of an object.
OnTriggerZoomWalk.OnTriggerEnter2D (UnityEngine.Collider2D other) (at Assets/scrips/OnTriggerZoomWalk.cs:21)
NullReferenceException: Object reference not set to an instance of an object.
OnTriggerZoomWalk.OnTriggerStay2D (UnityEngine.Collider2D other) (at Assets/scrips/OnTriggerZoomWalk.cs:30)
NullReferenceException: Object reference not set to an instance of an object.
OnTriggerZoomWalk.OnTriggerExit2D (UnityEngine.Collider2D other) (at Assets/scrips/OnTriggerZoomWalk.cs:43)

 

Its on my player and here is what my inspector looks like

 

That solved the problem
Thank you!