ModuleNotFoundError: No module named '_wsgi'

I have the same problem #234

1. clone the repo
2. cd into default_config folder
3. docker-compose up start the project
4. then meet this problem

I've try python 3.8-slim/python 3.8/python 3.9

`bash
server | Traceback (most recent call last):
server | File "/usr/local/bin/gunicorn", line 8, in
server | sys.exit(run())
server | File "/usr/local/lib/python3.9/site-packages/gunicorn/app/wsgiapp.py", line 67, in run
server | WSGIApplication("%(prog)s [OPTIONS] [APP_MODULE]").run()
server | File "/usr/local/lib/python3.9/site-packages/gunicorn/app/base.py", line 231, in run
server | super().run()
server | File "/usr/local/lib/python3.9/site-packages/gunicorn/app/base.py", line 72, in run
server | Arbiter(self).run()
server | File "/usr/local/lib/python3.9/site-packages/gunicorn/arbiter.py", line 58, in __init__
server | self.setup(app)
server | File "/usr/local/lib/python3.9/site-packages/gunicorn/arbiter.py", line 118, in setup
server | self.app.wsgi()
server | File "/usr/local/lib/python3.9/site-packages/gunicorn/app/base.py", line 67, in wsgi
server | self.callable = self.load()
server | File "/usr/local/lib/python3.9/importlib/__init__.py", line 127, in import_module
server | return _bootstrap._gcd_import(name[level:], package, level)
server | File "", line 1030, in _gcd_import
server | File "", line 1007, in _find_and_load
server | File "", line 984, in _find_and_load_unlocked
server | ModuleNotFoundError: No module named '_wsgi'
server exited with code 1
`