You run gunicorn app:app but get an error: ModuleNotFoundError: No module named 'app'. What is the likely cause?

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Flask - Deployment

You run gunicorn app:app but get an error: ModuleNotFoundError: No module named 'app'. What is the likely cause?

AGunicorn does not support Flask apps

BThe app.py file is missing or not in the current directory

CYou forgot to install Flask

DThe command syntax is incorrect

Step-by-Step Solution

Solution:

Step 1: Understand the error meaning
ModuleNotFoundError means Python cannot find the module named app.
Step 2: Check file presence and location
Gunicorn expects app.py or a module named app in the current directory. If missing or in another folder, this error occurs.
Final Answer:
The app.py file is missing or not in the current directory -> Option B
Quick Check:
ModuleNotFoundError = missing app.py file [OK]

Quick Trick: Ensure app.py is in current folder before running Gunicorn [OK]

Common Mistakes:

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