Getting [ModuleNotFoundError: No module named 'passlib'] this even passlib is already installed

Question

cjson not found, falling back to stdlib json Traceback (most recent call last):

. .

from Crypto.Hash import HMAC, SHA256, SHA384, SHA512 ModuleNotFoundError: No module named 'Crypto

also, from passlib.context import CryptContext ModuleNotFoundError: No module named 'passlib'