由于 gunicorn AppImportError，应用程序无法启动

Question

I created a pretty basic application using Python and Dash (datatables, html, etc.). I'm trying to run the application to deploy using gunicorn and Render, but I keep getting an error when I try to deploy it, below is the error:

File "/opt/render/project/src/.venv/lib/python3.7/site-packages/gunicorn/util.py", 
line 430, in import_app    raise 
AppImportError("Application object must be callable.")gunicorn.errors.AppImportError: 
Application object must be callable.

Every question or piece of documentation I find indicates that it could be something wrong with the naming of files / objects that I have used. Is it possible that the Dash functionality for creating a Dash table being

app = Dash(__ name__)

is causing issues with gunicorn's call to run an application? (see below)

gunicorn Fantasy_Stats_Tracking:app

Any help would be amazing! Thanks in advance!

Answer 1

The docs seems to say that you need to call app.server and not just app with Gunicorn in order for it to work.

gunicorn Fantasy_Stats_Tracking:app.server should do the trick, given that your Python file is named Fantasy_Stats_Tracking.py . ref1 ref2