labs-migration-assistant error

krenair@nova-precise2:~/migration-assistant/labs-migration-assistant (master)$ fab test --set wiki-username="Alex Monk"
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/Fabric-1.8.1-py2.7.egg/fabric/main.py", line 658, in main
    docstring, callables, default = load_fabfile(fabfile)
  File "/usr/local/lib/python2.7/dist-packages/Fabric-1.8.1-py2.7.egg/fabric/main.py", line 165, in load_fabfile
    imported = importer(os.path.splitext(fabfile)[0])
  File "/home/krenair/migration-assistant/labs-migration-assistant/fabfile.py", line 60, in <module>
    env.ignored_hosts = env.ignored_hosts.split(';')
  File "/usr/local/lib/python2.7/dist-packages/Fabric-1.8.1-py2.7.egg/fabric/utils.py", line 184, in __getattr__
    raise AttributeError(key)
AttributeError: ignored_hosts