问题
I got a VPS and I wanted to host my flask app there. I followed DigitalOcean's tutorial on "How To Serve Flask Applications with Gunicorn and Nginx on Ubuntu 18.04" (I didnt get the VPS from DO) and everything worked fine with the example app... when I tried to replace the files with my app's files and host the app again I get a 500 error. The 500 error doesnt appear everywhere. It comes up where my .db file is envoled like where I have posts or users etc.. Everything else loads up fine. The layout.html, footer, nav, static files and all that is there.
I already tried rebooting the server, checking env vars reloading nginx etc.. but nothing works.
When I run sudo systemctl status appname on terminal I get the following message
gunicorn[971]: return self.get_engine()
gunicorn[971]: File "/home/apost/atapazar/atapazarvenv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line
gunicorn[971]: return connector.get_engine()
gunicorn[971]: File "/home/apost/atapazar/atapazarvenv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line
gunicorn[971]: options = self.get_options(sa_url, echo)
gunicorn[971]: File "/home/apost/atapazar/atapazarvenv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line
gunicorn[971]: self._sa.apply_driver_hacks(self._app, sa_url, options)
gunicorn[971]: File "/home/apost/atapazar/atapazarvenv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line
gunicorn[971]: if sa_url.drivername.startswith('mysql'):
gunicorn[971]: AttributeError: 'NoneType' object has no attribute 'drivername'
I'm assuming it's a probelm with SQLite. The site should load the .html files that contain .db info.
Edit: Already checked the other question's here on Stack and even looked on Github but didnt find a solution. Also when I run the app on my local machine the probelm doesnt come up.
来源：https://stackoverflow.com/questions/56097919/flask-app-gives-a-nonetype-object-has-no-attribute-drivername-error