This operation is only valid for legacy predictors created with CreatePredictor. If you are not using a legacy predictor, use describe_auto_predictor.
See https://www.paws-r-sdk.com/docs/forecastservice_describe_predictor/ for full documentation.
forecastservice_describe_predictor(PredictorArn)[required] The Amazon Resource Name (ARN) of the predictor that you want information about.