[Python] ‘Fail due to unhealthy allocation' deploying django site using fly.io

I am super new to deployment and django and I’m trying to deploy a simple django site without database with fly.io. I’ve been getting errors for 4 days and would really appreciate it if anyone can help! The error is below

==> Creating release
--> release v3 created

--> You can detach the terminal anytime without stopping the deployment
==> Monitoring deployment
Logs: https://fly.io/apps/chaplinhuang/monitoring

1 desired, 1 placed, 0 healthy, 1 unhealthy [restarts: 2] [health checks: 1 total]
Failed Instances

Failure #1

Instance
ID PROCESS VERSION REGION DESIRED STATUS HEALTH CHECKS RESTARTS CREATED
00d71cce app 3 ord run pending 1 total 2 1m0s ago

Recent Events
TIMESTAMP TYPE MESSAGE
2022-12-26T02:05:54Z Received Task received by client
2022-12-26T02:05:54Z Task Setup Building Task Directory
2022-12-26T02:06:25Z Started Task started by client
2022-12-26T02:06:27Z Terminated Exit Code: 3
2022-12-26T02:06:27Z Restarting Task restarting in 1.042869453s
2022-12-26T02:06:44Z Started Task started by client
2022-12-26T02:06:46Z Terminated Exit Code: 3
2022-12-26T02:06:46Z Restarting Task restarting in 1.11932696s

2022-12-26T02:07:03Z [info][2022-12-26 02:07:03 +0000] [525] [INFO] Booting worker with pid: 525
2022-12-26T02:07:03Z [info][2022-12-26 02:07:03 +0000] [525] [ERROR] Exception in worker process
2022-12-26T02:07:03Z [info]Traceback (most recent call last):
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/site-packages/gunicorn/arbiter.py", line 589, in spawn_worker
2022-12-26T02:07:03Z [info] worker.init_process()
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/site-packages/gunicorn/workers/base.py", line 134, in init_process
2022-12-26T02:07:03Z [info] self.load_wsgi()
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/site-packages/gunicorn/workers/base.py", line 146, in load_wsgi
2022-12-26T02:07:03Z [info] self.wsgi = self.app.wsgi()
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/site-packages/gunicorn/app/base.py", line 67, in wsgi
2022-12-26T02:07:03Z [info] self.callable = self.load()
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/site-packages/gunicorn/app/wsgiapp.py", line 58, in load
2022-12-26T02:07:03Z [info] return self.load_wsgiapp()
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/site-packages/gunicorn/app/wsgiapp.py", line 48, in load_wsgiapp
2022-12-26T02:07:03Z [info] return util.import_app(self.app_uri)
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/site-packages/gunicorn/util.py", line 359, in import_app
2022-12-26T02:07:03Z [info] mod = importlib.import_module(module)
2022-12-26T02:07:03Z [info] File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
2022-12-26T02:07:03Z [info] return _bootstrap._gcd_import(name[level:], package, level)
2022-12-26T02:07:03Z [info] File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
2022-12-26T02:07:03Z [info] File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
2022-12-26T02:07:03Z [info] File "<frozen importlib._bootstrap>", line 992, in _find_and_load_unlocked
2022-12-26T02:07:03Z [info] File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
2022-12-26T02:07:03Z [info] File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
2022-12-26T02:07:03Z [info] File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
2022-12-26T02:07:03Z [info] File "<frozen importlib._bootstrap>", line 1004, in _find_and_load_unlocked
2022-12-26T02:07:03Z [info]ModuleNotFoundError: No module named 'demo'
2022-12-26T02:07:04Z [info][2022-12-26 02:07:04 +0000] [520] [INFO] Shutting down: Master
2022-12-26T02:07:04Z [info][2022-12-26 02:07:04 +0000] [520] [INFO] Reason: Worker failed to boot.
2022-12-26T02:07:04Z [info]Starting clean up.
--> v3 failed - Failed due to unhealthy allocations - no stable job version to auto revert to and deploying as v4

--> Troubleshooting guide at https://fly.io/docs/getting-started/troubleshooting/
Error abort


My current fly.toml


# fly.toml file generated for chaplinhuang on 2022-12-24T18:27:36+08:00

app = "chaplinhuang"
kill_signal = "SIGINT"
kill_timeout = 5
processes = []

[env]
PORT = "8080"

[experimental]
allowed_public_ports = []
auto_rollback = true

[[services]]
http_checks = []
internal_port = 8080
processes = ["app"]
protocol = "tcp"
script_checks = []
[services.concurrency]
hard_limit = 25
soft_limit = 20
type = "connections"

[[services.ports]]
force_https = true
handlers = ["http"]
port = 80

[[services.ports]]
handlers = ["tls", "http"]
port = 443

[[services.tcp_checks]]
grace_period = "30s"
interval = "15s"
restart_limit = 0
timeout = "2s"

[[statics]]
guest_path = "/app/public"
url_prefix = "/static/"


My current Dockerfile

ARG PYTHON_VERSION=3.10-slim-buster

FROM python:${PYTHON_VERSION}

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

RUN mkdir -p /code

WORKDIR /code

COPY requirements.txt /tmp/requirements.txt

RUN set -ex && \
pip install --upgrade pip && \
pip install -r /tmp/requirements.txt && \
rm -rf /root/.cache/

COPY . /code/

RUN python manage.py collectstatic --noinput

EXPOSE 8000

# replace demo.wsgi with <project_name>.wsgi
CMD ["gunicorn", "--bind", ":8000", "--workers", "2", "demo.wsgi"]



I have tried to change the port to 8080, but cannot change ip address to 0.0.0.0, what should I do? Any input is appreciated!

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