Quick question with a Camera Following script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class CameraFollow : MonoBehaviour {
 
     public Transform CameraTr;
     public Transform PlayerTr;
     Vector3 CameraStartingPos = CameraTr.position;
 
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
         CameraTr.position = PlayerTr.position + CameraStartingPos;
     }
 }

So the error comes in the "Vector 3 line" and I'm guessing Unity doesnt think of the position argument as a Vector and that's why I can't set CameraStartingPos as CameraTr.position. Could anyone explain me if I'm doing anything wrong or It's just not done this way? Thanks :D.