ModuleNotFoundError: No module named 'flask' - in the latest docker image

[zerolabnet]

Error in the latest docker image:

ModuleNotFoundError: No module named 'flask'
Traceback (most recent call last):
  File "/app/./run.py", line 1, in <module>
    from server.bp import bp
  File "/app/server/bp.py", line 1, in <module>
    from flask import Blueprint

[gosvoh]

Error still remain

[zken2002]

Same problem