Hi ansible gurus!

I'm writing a python script that uses ansible.playbook to do a rolling update, 
but I'm very confused by the following output at the end of my execution:

FATAL: all hosts have already failed -- aborting
{'unreachable': 0, 'skipped': 0, 'ok': 2, 'changed': 1, 'failures': 0}
{'unreachable': 0, 'skipped': 0, 'ok': 2, 'changed': 1, 'failures': 0}
{'unreachable': 0, 'skipped': 0, 'ok': 2, 'changed': 1, 'failures': 0}

The "FATAL: all hosts have already failed - aborting" message was printed by 
run() in

pb = ansible.playbook.PlayBook(...)
pb.run()

And I printed the last 3 lines with:

  hosts = sorted(pb.stats.processed.keys())
   #display(callbacks.banner("PLAY RECAP"))
   playbook_cb.on_stats(pb.stats)

   for h in hosts:
      t =pb.stats.summarize(h)
      if t['failures'] > 0:
         failed_hosts.append(h)
      if t['unreachable'] > 0:
         unreachable_hosts.append(h)

      print t

Can someone please explain to me why I'm getting a FATAL error message after 
ansible successfully executed on 3 nodes (3x 'ok' messages).

More info:

I have serial=2 and max_fail_percent=50

[maltfield@localhost altfield]$ ansible --version
ansible 1.5
[maltfield@ localhost altfield]$ uname -a
Linux zce-admin-02 2.6.32-220.23.1.el6.x86_64 #1 SMP Mon Jun 18 18:58:52 BST 
2012 x86_64 x86_64 x86_64 GNU/Linux

Thank you,
Michael Altfield

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