I am using python 2.7.3 and bin/py interpreter prompt to run :

...

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master = TestableMaster() master.start()

But the following error occurs :

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/sandesh/mail_man/mailman-3.0.0b2/src/mailman/testing/helpers.py", line 186, in start self.start_runners(runners) File "/home/sandesh/mail_man/mailman-3.0.0b2/src/mailman/bin/master.py", line 385, in start_runners for runner_config in config.runner_configs: File "/home/sandesh/mail_man/mailman-3.0.0b2/src/mailman/config/config.py", line 215, in runner_configs for section in self._config.getByCategory('runner', []): AttributeError: 'NoneType' object has no attribute 'getByCategory'

should i not use bin/py or anything else need to be done.