PhotonView with ID has no method marked with the [PunRPC](C#) property! BUT IT HAS ???

In my game 2 players only join a room and i have to switch turns between them so i do something like that:

 using UnityEngine;
 
 // .. more code
 public PhotonView photonView; // i get it from editor
 bool myTurn = false;
 
 void Start() {
     // .. some other code
 
     if (PhotonNetwork.player.isMasterClient) {
          myTurn = true;
     }
 }
 
 void Update() {
     // ... LOTS OF CODE
     if(myTurn) {
         // Play till i finish
     }
 
     if(EndOfTurn) {
         // ... Do things
 
         myTurn = false;
         photonView.RPC("SwitchTurns()", PhotonTargets.Others);
     }
 }
 
 // ... Many lines of code
 
 [PunRPC]
 void SwitchTurns()
 {
     myTurn = true;
 }

and my GameObject has the script and the PhotonView component (Owner is Fixed) with no Observed Components and I've tried observing the script same error too also tried making " SwitchTurns() " public and used " Photon.MonoBehaviour " instead nothing too

as you can see I'm not " using Photon; " if that have to do something...?

Please any clue would be great, Thank you!