Notebook debugger: Widget Javascript not detected

While running a cell with the code below:

from ipywidgets import widgets
from IPython.display import display
text = widgets.Text()
dislplay(text)

I get the error:

Widget Javascript not detected. It may not be installed properly. Did you enable the widgetsnbextension? If not, then run "jupyter nbextension enable --py --sys-prefix widgetsnbextension"

I've enabled the extension in the environment.   I made sure the project interpreter is set to the same environment (python 3.4) that works in a jupyter notebook web session.

Any ideas?