Declare it as envvar or define a default value

[RezaErfani67]

File "D:\Project\async-fastapi-mongo\venv\Lib\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: MONGO_DETAILS not found. Declare it as envvar or define a default value.