salt: AttributeError: 'Minion' object has no attribute 'schedule'

Hi, I am trying to upgrade our salt from v2014.7.0 to v2015.8.0 and I am getting some early errors. We are testing this running bootstrap-salt.sh executed from Vagrant masterless and we are getting the following error:

2015-10-05 17:39:01,126 [tornado.application                      ][ERROR   ][11202] Exception in callback <functools.partial object at 0x2225cb0>
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/tornado/ioloop.py", line 592, in _run_callback
    ret = callback()
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 275, in null_wrapper
    return fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/tornado/ioloop.py", line 598, in <lambda>
    self.add_future(ret, lambda f: f.result())
  File "/usr/local/lib/python2.7/dist-packages/tornado/concurrent.py", line 215, in result
    raise_exc_info(self._exc_info)
  File "/usr/local/lib/python2.7/dist-packages/tornado/gen.py", line 230, in wrapper
    yielded = next(result)
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 1462, in handle_event
    self.module_refresh(notify=data.get('notify', False))
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 1296, in module_refresh
    self.schedule.functions = self.functions
AttributeError: 'Minion' object has no attribute 'schedule'