Example imports fail about catalyst HOT 2 CLOSED

(catalyst-venv) bash-3.2$ catalyst ingest
catalyst ingest
Traceback (most recent call last):
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst-venv/bin/catalyst", line 7, in <module>
    from catalyst.__main__ import main
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst-venv/lib/python3.6/site-packages/catalyst/__init__.py", line 20, in <module>
    from . import data
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst-venv/lib/python3.6/site-packages/catalyst/data/__init__.py", line 1, in <module>
    from . import loader
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst-venv/lib/python3.6/site-packages/catalyst/data/loader.py", line 36, in <module>
    from catalyst.curate.poloniex import PoloniexCurator
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst-venv/lib/python3.6/site-packages/catalyst/curate/poloniex.py", line 9
    DT_START        = time.mktime(datetime(2010, 01, 01, 0, 0).timetuple())

(catalyst-venv) Bens-MacBook-Pro:catalyst bkc$ python
Python 3.6.1 (default, Apr  4 2017, 09:40:21)
[GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.38)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy as np
>>> from catalyst.api import cancel_order
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst/__init__.py", line 20, in <module>
    from . import data
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst/data/__init__.py", line 1, in <module>
    from . import loader
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst/data/loader.py", line 37, in <module>
    from catalyst.utils.calendars import get_calendar
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst/utils/calendars/__init__.py", line 16, in <module>
    from .trading_calendar import TradingCalendar
  File "/Users/bkc/Documents/code/projects/catalyst/catalyst/utils/calendars/trading_calendar.py", line 30, in <module>
    from catalyst.utils.calendars._calendar_helpers import (
ModuleNotFoundError: No module named 'catalyst.utils.calendars._calendar_helpers'