$ pipenv run start
Loading .env environment variables▒
* Tip: There are .env or .flaskenv files present. Do "pip install python-dotenv" to use them.
* Serving Flask app "app.py" (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: on
* Restarting with stat
c:\python3.6\python.exe: Error while finding module specification for 'C:\\Python3.6\\Scripts\\flask' (ModuleNotFoundError: No module named 'C:\\Python3')