Help with Pun RPC set Parent

RotemPhoton

Hey, i'm trying to make a shooters 2D game
i'm trying to do that when you spawn a gun will respawn as child of the player (because if I don't do it it will be very laggy for the other player).

I've succeeded to do it with my play but as i see when i'm trying to send the RPC to the other player i get error that the gun is null.

the guns are spawned but only the player that has the view can see the gun attached to him but it's not attached to the other player.

Here is the code:
private void Awake () {
if (photonView.isMine)
{

gun = PhotonNetwork.Instantiate(Resources.Load("M16A3").name, new Vector3(transform.position.x, transform.position.y, transform.position.z), Quaternion.identity, 0);
gun.transform.parent = transform;
photonView.RPC("SetParent", PhotonTargets.Others);
}

}

[PunRPC]
public void SetParent()
{
gun.transform.parent = transform;
}


Here is my error:
NullReferenceException: Object reference not set to an instance of an object PlayerHoldingWeapon.SetParent () (at Assets/PcompleteFiles/scripts/Weapons/PlayerHoldingWeapon.cs:52) System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222) Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation. System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:232) System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115) NetworkingPeer.ExecuteRpc (ExitGames.Client.Photon.Hashtable rpcData, Int32 senderID) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:2999) NetworkingPeer.OnEvent (ExitGames.Client.Photon.EventData photonEvent) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:2592) ExitGames.Client.Photon.PeerBase.DeserializeMessageAndCallback (System.Byte[] inBuff) ExitGames.Client.Photon.EnetPeer.DispatchIncomingCommands () ExitGames.Client.Photon.PhotonPeer.DispatchIncomingCommands () PhotonHandler.Update () (at Assets/Photon Unity