ModuleNotFoundError: No module named 'flask'

[Vagex]

Traceback (most recent call last):
File "/app/calibre-web/cps.py", line 28, in
from cps.main import main
File "/app/calibre-web/cps/init.py", line 28, in
from flask import Flask
ModuleNotFoundError: No module named 'flask'

I update to lastest,but is till issue, i had down to nightly-8abea1dd-ls113
who had issue it