can't save playerslist via stream in photon

Hello, When players join it will add the player object to the List i defined which is

 public static List<Player> players = new List<Player>();

like this way

 players.Add(player);

so the problem is that the new players will get the list with only the players who joins after them

so i decided to use OnPhotonSerializeView like this way

     void OnPhotonSerializeView(PhotonStream stream, PhotonMessageInfo info) {
         if(stream.isWriting) {
             Debug.Log("writing players");
             stream.SendNext(players);
         } else {
             Debug.Log("Receiving players");
             players = (List<Player>)stream.ReceiveNext();
         }
     }

and added photon view to the gameobject with script like this

i got two problems, first when sending player i get this error

 Exception: cannot serialize(): System.Collections.Generic.List`1[Player]
   at ExitGames.Client.Photon.Protocol16.Serialize (ExitGames.Client.Photon.StreamBuffer dout, System.Object serObject, Boolean setType) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.Protocol16.SerializeObjectArray (ExitGames.Client.Photon.StreamBuffer dout, System.Object[] objects, Boolean setType) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.Protocol16.Serialize (ExitGames.Client.Photon.StreamBuffer dout, System.Object serObject, Boolean setType) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.Protocol16.SerializeHashTable (ExitGames.Client.Photon.StreamBuffer dout, ExitGames.Client.Photon.Hashtable serObject, Boolean setType) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.Protocol16.Serialize (ExitGames.Client.Photon.StreamBuffer dout, System.Object serObject, Boolean setType) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.Protocol16.SerializeParameterTable (ExitGames.Client.Photon.StreamBuffer stream, System.Collections.Generic.Dictionary`2 parameters) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.Protocol16.SerializeOperationRequest (ExitGames.Client.Photon.StreamBuffer stream, Byte operationCode, System.Collections.Generic.Dictionary`2 parameters, Boolean setType) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.EnetPeer.SerializeOperationToMessage (Byte opCode, System.Collections.Generic.Dictionary`2 parameters, EgMessageType messageType, Boolean encrypt) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.EnetPeer.EnqueueOperation (System.Collections.Generic.Dictionary`2 parameters, Byte opCode, Boolean sendReliable, Byte channelId, Boolean encrypt, EgMessageType messageType) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.PeerBase.EnqueueOperation (System.Collections.Generic.Dictionary`2 parameters, Byte opCode, Boolean sendReliable, Byte channelId, Boolean encrypted) [0x00000] in <filename unknown>:0 
   at ExitGames.Client.Photon.PhotonPeer.OpCustom (Byte customOpCode, System.Collections.Generic.Dictionary`2 customOpParameters, Boolean sendReliable, Byte channelId, Boolean encrypt) [0x00000] in <filename unknown>:0 
   at LoadBalancingPeer.OpRaiseEvent (Byte eventCode, System.Object customEventContent, Boolean sendReliable, .RaiseEventOptions raiseEventOptions) [0x00134] in C:\Users\EAZYE\Documents\New Unity Project2\Assets\Photon\Photon Unity 
  

and the second player when player goes back to the scene i get this error

 PhotonView ID duplicate found: 1. New: View (0)1 on GameManager (scene) old: View (0)1 on GameManager (scene). Maybe one wasn't destroyed on scene load?! Check for 'DontDestroyOnLoad'. Destroying old entry, adding new.

any ideas please??