public Builder setExecuteStepResponse(main.Messages.ExecuteStepResponse value) {
        if (executeStepResponseBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          executeStepResponse_ = value;
          onChanged();
        } else {
          executeStepResponseBuilder_.setMessage(value);
        }
        bitField0_ |= 0x00000100;
        return this;
      }