Operation failed: OperationResponse 219: ReturnCode: -2 (Rpc is not enabled).

Hello, I have an error message that I would like to understand better, what does Rpc is not enabled mean? I presume this is an error message that is from within the Server - but since we don't use a custom Photon server what does it mean to me as a client side developer? Is this just a server issue or is there something I can do to or should be worries about?

The error message is
Operation failed: OperationResponse 219: ReturnCode: -2 (Rpc is not enabled). Parameters: {} Server: GameServer

And the stacktrace is
UnityEngine.Debug:LogError(Object) NetworkingPeer:OnOperationResponse(OperationResponse) (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/NetworkingPeer.cs:1532) ExitGames.Client.Photon.PeerBase:DeserializeMessageAndCallback(Byte[]) ExitGames.Client.Photon.EnetPeer:DispatchIncomingCommands() ExitGames.Client.Photon.PhotonPeer:DispatchIncomingCommands() PhotonHandler:Update() (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonHandler.cs:157)


Whenever I trigger this error this is what I suspect from the client side

• This happens during a time when I have to send out multiple RPC calls (ending a player turn)
  

From the documentation online, all I can find this API page from the Photon Server platform
https://doc-api.photonengine.com/en/server/current/class_photon_1_1_load_balancing_1_1_common_1_1_l_b_error_messages.html
But it doesn't tell me anything, any insight on the error message is appreciated