Can't import dash_core_components

I installed dash on ubuntu 18.04:
pip3 install dash

Then I have a test program, test.py, and I get the following error. What is wrong?

import os, pandas as pd
import plotly
import dash
import dash_core_components as dcc <<<<<<<<<<<<< error here:
Exception has occurred:SystemExit
1
File "…/test.py, line 4, in
import dash_core_components as dcc
File "…/test.py, line 3, in
import dash

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