ImportError: No module named 'featurehub.problems.demo'

After I started a server and tried to run demo notebook, the first cell will fail due to 

>ImportError                               Traceback (most recent call last)
><ipython-input-8-057755431826> in <module>()
>    1 
>----> 2 from featurehub.problems.demo import commands
>
>ImportError: No module named 'featurehub.problems.demo'
