code: def simulate_async_error(self, exception):
          
          task_id = gen_unique_id()
          async_result = self.AsyncResult(task_id)
          einfo = ExceptionInfo(sys.exc_info())
  
          async_result.backend.mark_as_failure(
              task_id,
              exception,
              traceback=einfo.traceback,
          )
  
          return async_result
docs: Take this exception and store it as an error in the result backend.
          This unifies the handling of broker-connection errors with any other
          type of error that might occur when running the task. So the same
          error-handling that might retry a task or display a useful message to
          the user can also handle this error.