public Builder mergeError(JSystemPiqi.system_error value) {
        if (errorBuilder_ == null) {
          if (((bitField0_ & 0x00000002) == 0x00000002) &&
              error_ != JSystemPiqi.system_error.getDefaultInstance()) {
            error_ =
              JSystemPiqi.system_error.newBuilder(error_).mergeFrom(value).buildPartial();
          } else {
            error_ = value;
          }
          onChanged();
        } else {
          errorBuilder_.mergeFrom(value);
        }
        bitField0_ |= 0x00000002;
        return this;
      }