docs: protected JsonObjectBase buildParamError(String field, String message, ErrorCode errorCode) {
          Map<String, String> map = new HashMap<String, String>();
          map.put(field, message);
          if (errorCode == null) {
              return JsonObjectUtils.buildFieldError(map, ErrorCode.FIELD_ERROR);
          }
          return JsonObjectUtils.buildFieldError(map, errorCode);
      }