Jinja2

Well, Although I successfully install streamlit by
pip install streamlit,
when I try to test it by running:
streamllit hello
it warns me:
ImportError: Missing optional dependency 'Jinja2'. DataFrame.style requires jinja2. Use pip or conda to install Jinja2.
And, I try to install Jinja2 by pip, and it installed successfully, but when I run command
streamlit hello,
it failed again…
I search on google, and none of it work.