problem in running firewall

[kabagaba]

mininet@mininet-vm:~/pox$ ./pox.py log.level --DEBUG forwarding.hub pox.misc.firewall1
POX 0.2.0 (carp) / Copyright 2011-2013 James McCauley, et al.
INFO:forwarding.hub:Hub running.
DEBUG:misc.firewall1:Enabling Firewall Module
DEBUG:core:POX 0.2.0 (carp) going up...
DEBUG:core:Running on CPython (2.7.6/Mar 22 2014 22:59:56)
DEBUG:core:Platform is Linux-3.13.0-24-generic-x86_64-with-Ubuntu-14.04-trusty
INFO:core:POX 0.2.0 (carp) is up.
DEBUG:openflow.of_01:Listening on 0.0.0.0:6633
INFO:openflow.of_01:[00-00-00-00-00-01 1] connected
INFO:forwarding.hub:Hubifying 00-00-00-00-00-01
ERROR:core:Exception while handling OpenFlowNexus!ConnectionUp...
Traceback (most recent call last):
File "/home/mininet/pox/pox/lib/revent/revent.py", line 231, in raiseEventNoErrors
return self.raiseEvent(event, _args, *_kw)
File "/home/mininet/pox/pox/lib/revent/revent.py", line 278, in raiseEvent
rv = event._invoke(handler, _args, *_kw)
File "/home/mininet/pox/pox/lib/revent/revent.py", line 156, in _invoke
return handler(self, _args, *_kw)
File "/home/mininet/pox/pox/misc/firewall1.py", line 36, in _handle_ConnectionUp
policies = self.read_policies(policyFile)
File "/home/mininet/pox/pox/misc/firewall1.py", line 32, in read_policies
policies[row['id']] = Policy(EthAddr(row['mac_0']), EthAddr(row['mac_1']))
File "/home/mininet/pox/pox/lib/addresses.py", line 105, in init
raise RuntimeError("Expected ethernet address string to be 6 raw "
RuntimeError: Expected ethernet address string to be 6 raw bytes or some hex

guys can u please tell me, how to sort it out this issue?