runtime error

4, in run return loop.run_until_complete(main) File "/usr/local/lib/python3.10/asyncio/base_events.py", line 649, in run_until_complete return future.result() File "/usr/local/lib/python3.10/site-packages/uvicorn/server.py", line 68, in serve config.load() File "/usr/local/lib/python3.10/site-packages/uvicorn/config.py", line 467, in load self.loaded_app = import_from_string(self.app) File "/usr/local/lib/python3.10/site-packages/uvicorn/importer.py", line 21, in import_from_string module = importlib.import_module(module_str) File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1050, in _gcd_import File "<frozen importlib._bootstrap>", line 1027, in _find_and_load File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 688, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 883, in exec_module File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed File "/home/user/app/app/app.py", line 7, in <module> from app.db import User, create_db_and_tables File "/home/user/app/app/db.py", line 36, in <module> engine = create_async_engine(DATABASE_URL) File "/usr/local/lib/python3.10/site-packages/sqlalchemy/ext/asyncio/engine.py", line 117, in create_async_engine sync_engine = _create_engine(url, **kw) File "<string>", line 2, in create_engine File "/usr/local/lib/python3.10/site-packages/sqlalchemy/util/deprecations.py", line 281, in warned return fn(*args, **kwargs) # type: ignore[no-any-return] File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/create.py", line 548, in create_engine u = _url.make_url(url) File "/usr/local/lib/python3.10/site-packages/sqlalchemy/engine/url.py", line 842, in make_url raise exc.ArgumentError( sqlalchemy.exc.ArgumentError: Expected string or URL object, got None

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