Traceback (most recent call last):

 "/usr/share/w3af/w3af/core/ui/gui/main.py", line 609, in start_scan_wrap
real_scan_start()

 "/usr/share/w3af/w3af/core/ui/gui/main.py", line 600, in real_scan_start
self.w3af.start()

 "/usr/share/w3af/w3af/core/controllers/w3afCore.py", line 191, in start
self.strategy.start()

 "/usr/share/w3af/w3af/core/controllers/core_helpers/strategy.py", line 96, in start
self._seed_discovery()

 "/usr/share/w3af/w3af/core/controllers/core_helpers/strategy.py", line 423, in _seed_discovery
self._seed_producer.seed_output_queue(cf.cf.get('targets'))

 "/usr/share/w3af/w3af/core/controllers/core_helpers/consumers/seed.py", line 104, in seed_output_queue
kb.kb.add_fuzzable_request(_seed)

 "/usr/share/w3af/w3af/core/data/kb/knowledge_base.py", line 283, in decorated
return _method(self, *args, **kwargs)

 "/usr/share/w3af/w3af/core/data/kb/knowledge_base.py", line 671, in add_fuzzable_request
self.add_url(fuzzable_request.get_url())

 "/usr/share/w3af/w3af/core/data/kb/knowledge_base.py", line 283, in decorated
return _method(self, *args, **kwargs)

 "/usr/share/w3af/w3af/core/data/kb/knowledge_base.py", line 652, in add_url
return self.urls.add(url)AttributeError: 'DBKnowledgeBase' object has no attribute 'urls'
invalid output was: Traceback (most recent call last):

 "/home/alan/.ansible/tmp/ansible-1383244452.89-240799362355153/ec2", line 1587, in <module>
main()

 "/home/alan/.ansible/tmp/ansible-1383244452.89-240799362355153/ec2", line 645, in main
(instance_dict_array, new_instance_ids, changed) = create_instances(module, ec2)

 "/home/alan/.ansible/tmp/ansible-1383244452.89-240799362355153/ec2", line 479, in create_instances
ec2.create_tags(instids, module.from_json(instance_tags))

 "/home/alan/.ansible/tmp/ansible-1383244452.89-240799362355153/ec2", line 1402, in from_json
return json.loads(data)

 "/usr/lib/python2.7/json/__init__.py", line 328, in loads
return _default_decoder.decode(s)

 "/usr/lib/python2.7/json/decoder.py", line 365, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())TypeError: expected string or buffer