Error when instantiating Cache() from dask.cache

`

NameError Traceback (most recent call last)
in ()
----> 1 cache = Cache(cache=2e9)

/Home/unic/milesg/anaconda3/envs/py34/lib/python3.4/site-packages/dask/cache.py in init(self, cache, _args, *_kwargs)
31 def init(self, cache, _args, *_kwargs):
32 if isinstance(cache, Number):
---> 33 cache = cachey.Cache(cache, _args, *_kwargs)
34 else:
35 assert not args and not kwargs

NameError: name 'cachey' is not defined`