GKError.Code.unknown The system can’t complete the requested operation due to an unknown error. Declarationcase unknown See AlsoCommunication ErrorsGKError.Code.cancelledGKError.Code.communicationsFailureGKError.Code.invalidPlayerGKError.Code.invalidParameterGKError.Code.gameSessionRequestInvalidGKError.Code.apiNotAvailableGKError.Code.connectionTimeoutGKError.Code.apiObsolete