error in decouple.py

[yangboz]

first off, thanks for this great tutorial, after clone this repository,

when running it with out venv only conda env with required pip libs, some errors happen, please check:

envs/py39/lib/python3.9/site-packages/decouple.py", line 92, in get
    raise UndefinedValueError('{} not found. Declare it as envvar or define a default value.'.format(option))
decouple.UndefinedValueError: secret not found. Declare it as envvar or define a default value.

any idea?