No module named 'bs4'

[cygabon]

Hi !
I don't know why I've got this error message when trying to inject the js with the line:

~/.local/bin/mitmdump -s injector.py 'http://192.168.1.32:8000/script.js

in script injector.py: No module named 'bs4'
Proxy server listening at http://*:8080

Of course I've tryed to reinstall bs4 with pip3, pip and even apt but same issue...

I was thinking that BeautifulSoup may use an other version of python
Or isn't installed for the used version of python (3.6.5) ?

But

python3
from bs4 import BeautifulSoup

Doesn't return any error and same result with python (2.7)....

I've also tried with the mitdump binarie file without success :/

Any ideas or others people with same issue ?