AWS CNN-QR forecast without futurefilling

Question

I am currently using AWS Forecasting service. I have filling policy for related data set. Since I use CNN-qr I do not declare future filling for filling, however It gives an error as follows. Why is that so ?

An error occurred (InvalidInputException) when calling the CreatePredictor operation: Required parameters are not found. Required : {feature_name_xxx=[futurefill],

EDIT:

I cannot share the the whole code bu this is the relevant part. I am using lambda function

- AttributeName: feature_name_xxx
 FeaturizationPipeline:
   - FeaturizationMethodName: filling
     FeaturizationMethodParameters: {"backfill": "mean",
                                     "middlefill": "mean"}