code: function defaultTransformError(err,req){
      let body = {
          code: err.code,
          message: err.message,
          data: err.data,
      }
  
      if (req._expressDeliverOptions.printErrorStack===true){
          body.stack = err.stack
      }
  
      if (err.name == 'InternalError' && req._expressDeliverOptions.printInternalErrorData!==true){
          delete body.data
      }
  
      return {
          status:false,
          error:body
      }
  }
docs: Default error response transformation
  @param  {Exception} err
  @param  {Request} req
  @return {Object}