ModuleNotFoundError: No module named 'flask' on calibre_web

- OS: Qnap - How docker service was installed: Portainer Container logs: from cps.main import main File "/app/calibre-web/cps/__init__.py", line 28, in from flask import Flask ModuleNotFoundError: No module named 'flask' fixed: editing the container ENV PATH to: /lsiopy/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin Success================================================================================================== [migrations] started [migrations] no migrations found ─────────────────────────────────────── ██╗ ███████╗██╗ ██████╗ ██║ ██╔════╝██║██╔═══██╗ ██║ ███████╗██║██║ ██║ ██║ ╚════██║██║██║ ██║ ███████╗███████║██║╚██████╔╝ ╚══════╝╚══════╝╚═╝ ╚═════╝ Brought to you by linuxserver.io ─────────────────────────────────────── To support LSIO projects visit: https://www.linuxserver.io/donate/ ─────────────────────────────────────── GID/UID ─────────────────────────────────────── User UID: 1000 User GID: 1000 ─────────────────────────────────────── [custom-init] No custom files found, skipping... [ls.io-init] done.