I used google ads Api to change keywords bid, but reported a 
GoogleAdsException error, the code is as follows:
    String keywordResource = ResourceNames.adGroupCriterion (
                     accountId,
                    adGroupId,
                  keywordId);
             AdGroupCriterion.Builder adGroupCriterion = 
AdGroupCriterion.newBuilder ()
                     .setType (CriterionTypeEnum.CriterionType.KEYWORD)
                     .setResourceName (keywordResource)
                     .setBidModifier (DoubleValue.of 
(keywordBidToBeUpdated.getNewBid ()));
             AdGroupCriterionOperation operation = 
AdGroupCriterionOperation.newBuilder ()
                     .setUpdate (adGroupCriterion)
                    .setUpdateMask (FieldMasks.allSetFieldsOf 
(adGroupCriterion.build ()))
                     .build ();
             operationList.add (operation);
............................
AdGroupCriterionServiceClient.mutateAdGroupCriteria(accountId,operationList);

the error  is :
   com.google.ads.googleads.v2.errors.GoogleAdsException: errors {
  error_code {
    criterion_error: CANNOT_BID_MODIFY_CRITERION_TYPE
  }
  message: "Cannot set bid modifier for this criterion type."
  trigger {
    string_value: ""
  }
  location {
    field_path_elements {
      field_name: "operations"
      index {
      }
    }
    field_path_elements {
      field_name: "update"
    }
    field_path_elements {
      field_name: "bid_modifier"
    }
  }
}

            

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