How to solve dj_database_url error

Hello,

I have been following the ‘How to Deploy a Django App on App Platform’ tutorial and I keep getting the following error during deploy:

File "/workspace/.heroku/python/lib/python3.8/site-packages/dj_database_url.py", line 103, in parse
engine = SCHEMES[url.scheme] if engine is None else engine
KeyError: ''

[11] [INFO] Worker exiting (pid: 11)
[1] [INFO] Shutting down: Master
[INFO] Reason: Worker failed to boot.

The configuration regarding the database in settings.py is identical to the one used in the tutorial:

DEVELOPMENT_MODE = os.getenv("DEVELOPMENT_MODE", "False") == "True"

if DEVELOPMENT_MODE is True:
    DATABASES = {
        "default": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": os.path.join(BASE_DIR, "db.sqlite3"),
        }
    }
elif len(sys.argv) > 0 and sys.argv[1] != 'collectstatic':
    if os.getenv("DATABASE_URL", None) is None:
        raise Exception("DATABASE_URL environment variable not defined")
    DATABASES = {
        "default": dj_database_url.parse(os.environ.get("DATABASE_URL")),
    }

Any clue on this?

Thanks a lot.