PhotonView with ID 1003 has no method

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Hello, I have some problems with my game


here is the error:
PhotonView with ID 1003 has no method "DestroyProjectile" marked with the [PunRPC](C#) or @PunRPC(JS) property! Args: String
UnityEngine.Debug:LogError(Object)
NetworkingPeer:ExecuteRpc(Hashtable, Int32) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:3127)
NetworkingPeer:RPC(PhotonView, String, PhotonTargets, PhotonPlayer, Boolean, Object[]) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:3893)