Serialize is working in debug, but it has no effect

I've got error like this:

 The observed monobehaviour (PlayerController(Clone)) of this PhotonView does not implement OnPhotonSerializeView()!

my script looks like this

 using UnityEngine;
 using System.Collections;
 
 public class NetworkController : Photon.MonoBehaviour {
 
     Vector3 actPosition = Vector3.zero;
     Quaternion actRotation = Quaternion.identity;
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     public void Update () 
     {
     if (photonView.isMine) 
         {
         } 
         else 
         {
             transform.position = Vector3.Lerp(transform.position, actPosition, 0.3f);
             transform.rotation = Quaternion.Lerp(transform.rotation, actRotation, 0.3f);
         }
     }
 
     public void OnPhotonSerializeView(PhotonStream stream, PhotonMessageInfo info){
     
 
     if (stream.isWriting) {
             stream.SendNext (transform.position);
             stream.SendNext (transform.rotation);
             Debug.Log ("Serialize is sending smth");
         } else {
             Debug.Log ("Serializ is receiving smth");
             actPosition = (Vector3)stream.ReceiveNext();
             transform.rotation = (Quaternion)stream.ReceiveNext ();
         }
     }
 }

both debugs are working. Somehow it doesnt work. What is more, I drag&dropped script to PhotonView. What I did wrong?