Is gunicorn installed through pip prior to running the command? Potentially through pip install -r requirements.txt or pip install gunicorn directly?

Check the virtual environment, created or activated:

• python3 -m venv venv (create)
• source venv/bin/activate (activate)
• pip install gunicorn (install)

Please keep these forums English only.

Hi. gunicorn is not installed. You need to install gunicorn first.

Command to install gunicorn is: pip install gunicorn

It's better to include it inside your requirements.txt file.

You can visit their website too: https://gunicorn.org/#quickstart

$ pip install gunicorn $ cat myapp.py def app(environ, start_response): data = b"Hello, World!\n" start_response("200 OK", [ ("Content-Type", "text/plain"), ("Content-Length", str(len(data))) ]) return iter([data]) $ gunicorn -w 4 myapp:app [2014-09-10 10:22:28 +0000] [30869] [INFO] Listening at: http://127.0.0.1:8000 (30869) [2014-09-10 10:22:28 +0000] [30869] [INFO] Using worker: sync [2014-09-10 10:22:28 +0000] [30874] [INFO] Booting worker with pid: 30874 [2014-09-10 10:22:28 +0000] [30875] [INFO] Booting worker with pid: 30875 [2014-09-10 10:22:28 +0000] [30876] [INFO] Booting worker with pid: 30876 [2014-09-10 10:22:28 +0000] [30877] [INFO] Booting worker with pid: 30877

WE're having the same error message but we have it in our requirements.txt and we have tried in a file named: nixpacks.toml

providers = ["python"]

[phases.install]

cmds = ["pip install -r requirements.txt"]

[phases.start]

cmds = ["gunicorn zillowWeb.wsgi"]

Go to the service settings and find providers there. Add python to the list of providers.

If this does not help, make sure that gunicorn is installed with the command pip install gunicorn or pip install -r requirements.txt