Open Stack

I have not worked with databases much and this is my first attempt
at a database migration. I am trying to follow this Howto:
https://wiki.openstack.org/wiki/Neutron/DatabaseMigration

I get the following error at step 3:

/opt/stack/quantum[master] $ quantum-db-manage --config-file /etc/quantum/quantum.conf --config-file /etc/quantum/plugins/cisco/cisco_plugins.ini stamp head
Traceback (most recent call last):
  File "/usr/local/bin/quantum-db-manage", line 9, in <module>
    load_entry_point('quantum==2013.2.a882.g0fc6605', 'console_scripts', 'quantum-db-manage')()
  File "/opt/stack/quantum/quantum/db/migration/cli.py", line 136, in main
    CONF.command.func(config, CONF.command.name)
  File "/opt/stack/quantum/quantum/db/migration/cli.py", line 81, in do_stamp
    sql=CONF.command.sql)
  File "/opt/stack/quantum/quantum/db/migration/cli.py", line 54, in do_alembic_command
    getattr(alembic_command, cmd)(config, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/alembic/command.py", line 221, in stamp
    script.run_env()
  File "/usr/local/lib/python2.7/dist-packages/alembic/script.py", line 193, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/local/lib/python2.7/dist-packages/alembic/util.py", line 177, in load_python_file
    module = imp.load_source(module_id, path, open(path, 'rb'))
  File "/opt/stack/quantum/quantum/db/migration/alembic_migrations/env.py", line 100, in <module>
    run_migrations_online()
  File "/opt/stack/quantum/quantum/db/migration/alembic_migrations/env.py", line 73, in run_migrations_online
    poolclass=pool.NullPool)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/__init__.py", line 338, in create_engine
    return strategy.create(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 48, in create
    u = url.make_url(name_or_url)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/url.py", line 178, in make_url
    return _parse_rfc1738_args(name_or_url)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/url.py", line 219, in _parse_rfc1738_args
    "Could not parse rfc1738 URL from string '%s'" % name)
sqlalchemy.exc.ArgumentError: Could not parse rfc1738 URL from string ''