Google App Engine deploying django ModuleNotFoundError: No module named 'app.wsgi.application'; 'app.wsgi' is not a package

I have encounter this error '502 Bad Gateway nginx' when running a django app on google app engine. When I check the logs I got this

Traceback (most recent call last): File "/layers/google.python.pip/pip/lib/python3.9/site-packages/gunicorn/arbiter.py", line 589, in spawn_worker worker.init_process() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/gunicorn/workers/base.py", line 134, in init_process self.load_wsgi() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/gunicorn/workers/base.py", line 146, in load_wsgi self.wsgi = self.app.wsgi() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/gunicorn/app/base.py", line 67, in wsgi self.callable = self.load() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/gunicorn/app/wsgiapp.py", line 58, in load return self.load_wsgiapp() File "/layers/google.python.pip/pip/lib/python3.9/site-packages/gunicorn/app/wsgiapp.py", line 48, in load_wsgiapp return util.import_app(self.app_uri) File "/layers/google.python.pip/pip/lib/python3.9/site-packages/gunicorn/util.py", line 359, in import_app mod = importlib.import_module(module) File "/opt/python3.9/lib/python3.9/importlib/__init__.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1030, in _gcd_import File "<frozen importlib._bootstrap>", line 1007, in _find_and_load File "<frozen importlib._bootstrap>", line 981, in _find_and_load_unlocked ModuleNotFoundError: No module named 'app.wsgi.application'; 'app.wsgi' is not a package

Here is my app.yaml

runtime: python39
entrypoint: gunicorn -b :$PORT --chdir app/ app.wsgi:application

handlers:
  - url: /static
    static_dir: static/
  - url: /.*
    script: auto

docker-compose-deploy.yml

version: '3.9'

services:
  gcloud:
    image: google/cloud-sdk:341.0.0-slim
    volumes:
      - gcp-creds:/creds
      - .:/app
    working_dir: /app
    environment:
      - CLOUDSDK_CONFIG=/creds

volumes:
  gcp-creds:

requirements.txt

Django>=3.2.3,<3.3
gunicorn>=20.1.0,<20.2
google-cloud-secret-manager>=2.4.0,<2.5
google-cloud-ndb>=1.8,<1.9

No error when deploy everything went smooth. Any idea will be appreciated.