ImportError: No module named backend

[hoyeunglee]

when try the example
got error

consumer.py

from carrot.messaging import Consumer
from carrot.connection import BrokerConnection

conn = BrokerConnection(hostname="localhost", port=5672,
                        userid="test", password="test",
                        virtual_host="test")
consumer = Consumer(connection=conn, queue="feed",exchange="feed", routing_key="importer")

def import_feed_callback(message_data, message):
     feed_url = message_data["import_feed"]
     print("Got feed import message for: %s" % feed_url)
     # something importing this feed url
     # import_feed(feed_url)
     message.ack()

consumer.register_callback(import_feed_callback)
consumer.wait() # Go into the consumer loop.