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I am trying to deploy a relatively simple flask app to 'app engine'.

However, after deploying and then running 'gcloud app browse', i am getting the following internal server error (stack trace sample):

 File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked: ModuleNotFoundError: No module named 'main' at _find_and_load (<frozen importlib._bootstrap>:983) at _gcd_import (<frozen importlib._bootstrap>:1006) at import_module (/opt/python3.7/lib/python3.7/importlib/__init__.py:127) at import_app (/env/lib/python3.7/site-packages/gunicorn/util.py:358) at load_wsgiapp (/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py:39) at load (/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py:49) at wsgi (/env/lib/python3.7/site-packages/gunicorn/app/base.py:67) at load_wsgi (/env/lib/python3.7/site-packages/gunicorn/workers/base.py:144) at init_process (/env/lib/python3.7/site-packages/gunicorn/workers/base.py:119) at init_process (/env/lib/python3.7/site-packages/gunicorn/workers/gthread.py:92) at spawn_worker (/env/lib/python3.7/site-packages/gunicorn/arbiter.py:583)

The error seems to be emanating from the gunicorn library.

I am deploying to the standard environment and my app.yaml file is simply:

runtime: python37

Any ideas why this might be happening?

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  • As @gaefan said, check for the existence of the main.py file. Also, this SO thread may be helpful Commented May 15, 2020 at 7:30

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App engine expects to see a file called main.py alongside your app.yaml file. It seems that this file isn't present.

See Google's samples to guide you: https://github.com/GoogleCloudPlatform/python-docs-samples/tree/master/appengine/standard_python37/hello_world

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