code: def push_error_to_driver(worker, error_type, message, driver_id=None):
      
      if driver_id is None:
          driver_id = ray.DriverID.nil()
      worker.raylet_client.push_error(driver_id, error_type, message,
                                      time.time())
docs: Push an error message to the driver to be printed in the background.
  
      Args:
          worker: The worker to use.
          error_type (str): The type of the error.
          message (str): The message that will be printed in the background
              on the driver.
          driver_id: The ID of the driver to push the error message to. If this
              is None, then the message will be pushed to all drivers.