need help with this Kombu error
Question: Pardon the copy and paste from the python interpreter but I'm trying to play
with Kombu but I can't seem to create a consumer. Please help, I'm utterly in
the dark here.

    
    
    >>> from kombu.messaging import Consumer, Producer
    >>> from kombu.entity import Exchange, Queue
    >>> x = Exchange("stmt",type="topic")
    >>> helloQ = Queue("hello", exchange=x, routing_key="stmt.hello")
    >>>
    >>> from kombu.connection import BrokerConnection
    >>> conn = BrokerConnection("scheduledb.lab.compete.com", "clippy", "clippy", "clippy")
    >>> channel = conn.channel()
    >>> c = Consumer(channel, helloQ)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 231, in __init__
    self.declare()
    File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 241, in declare
        queue.declare()
    File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 362, in declare
        self.name and self.queue_declare(nowait, passive=False),
    File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 380, in queue_declare
        nowait=nowait)
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 14, in blocking
        return __sync_current(fun, *args, **kwargs)
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 30, in __blocking__
        return fun(*args, **kwargs)
    File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/channel.py", line 1294, in queue_declare
    File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/abstract_channel.py", line 89, in wait
    File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/connection.py", line 218, in _wait_method
    File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/abstract_channel.py", line 105, in wait
    File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/connection.py", line 367, in _close
    amqplib.client_0_8.exceptions.AMQPConnectionException: (530, u"NOT_ALLOWED - parameters for queue 'hello' in vhost 'clippy' not equivalent", (50, 10), 'Channel.queue_declare')
    >>> boundX = x(helloQ)
    >>> c = Consumer(channel, helloQ)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 231, in __init__
        self.declare()
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/messaging.py", line 241, in declare
        queue.declare()
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 361, in declare
        return (self.name and self.exchange.declare(nowait),
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/entity.py", line 151, in declare
    nowait=nowait)
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 14, in blocking
        return __sync_current(fun, *args, **kwargs)
      File "/usr/lib/python2.6/site-packages/kombu-1.0.6-py2.6.egg/kombu/syn.py", line 30, in __blocking__
         return fun(*args, **kwargs)
      File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/channel.py", line 839, in exchange_declare
      File "build/bdist.cygwin-1.7.8-i686/egg/amqplib/client_0_8/abstract_channel.py", line 69, in _send_method
    AttributeError: 'NoneType' object has no attribute 'method_writer'
    


Answer: Look at the error

    
    
    amqplib.client_0_8.exceptions.AMQPConnectionException: (530, u"NOT_ALLOWED - parameters for queue 'hello' in vhost 'clippy' not equivalent", (50, 10), 'Channel.queue_declare')
    

This means the queue has already been declared, but with other parameters than
what you are declaring it with now.

