Twisted and starpy error (python)

I'm using this:

from twisted.web.client import getPage
df = getPage(url) # there is some url

I'm getting the following error. Please can anyone guide me on this

ERROR:twsited:Unhandled error in Deferred:
ERROR:twsited:Unhandled Error
Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/starpy/manager.py", line 123, in lineReceived
    self.dispatchIncoming() # does dispatch and clears cache
  File "/usr/local/lib/python2.6/dist-packages/starpy/ma开发者_开发技巧nager.py", line 200, in dispatchIncoming
    callback( message )
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 243, in callback
    self._startRunCallbacks(result)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 312, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 328, in _runCallbacks
    self.result = callback(self.result, *args, **kw)
  File "/usr/local/lib/python2.6/dist-packages/starpy/manager.py", line 298, in errorUnlessResponse
    raise error.AMICommandFailure( message )
starpy.error.AMICommandFailure: {'message': 'Channel not specified', 'response': 'Error', 'actionid': 'askme-158811948-5'}

I'm not sure this error is due to getPage() method because even when i've commented this it still give me the same error. Can anyone help. I can't figure out the reason for the error and where it is generated

The code posted is not complete. The error is not due to getPage. From the stack trace clues, this uses AMIProtocol (line receiver) . I guess some where you have to specify your protocol channel in AMIProtocol

setVar(self, channel, variable, value) in star.py.

This is not a twisted issue.