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Sahara install error, AttributeError: 'NoneType' object has no attribute '_get_entrypoint'

when i run sahara-db-manage --config-file /etc/sahara/sahara.conf upgrade head

[martin@localhost ~]$ su -
Password: 
Last login: Thu Mar 31 05:22:32 PDT 2016 on pts/0
ABRT has detected 2 problem(s). For more info run: abrt-cli list --since 1459426953
[root@localhost ~]# sahara-db-manage --config-file /etc/sahara/sahara.conf upgrade head
Traceback (most recent call last):
  File "/bin/sahara-db-manage", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/sahara/db/migration/cli.py", line 110, in main
    CONF.command.func(config, CONF.command.name)
  File "/usr/lib/python2.7/site-packages/sahara/db/migration/cli.py", line 49, in do_upgrade_downgrade
    do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
  File "/usr/lib/python2.7/site-packages/sahara/db/migration/cli.py", line 30, in do_alembic_command
    getattr(alembic_cmd, cmd)(config, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/alembic/command.py", line 174, in upgrade
    script.run_env()
  File "/usr/lib/python2.7/site-packages/alembic/script/base.py", line 397, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/lib/python2.7/site-packages/alembic/util/pyfiles.py", line 81, in load_python_file
    module = load_module_py(module_id, path)
  File "/usr/lib/python2.7/site-packages/alembic/util/compat.py", line 79, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "/usr/lib/python2.7/site-packages/sahara/db/migration/alembic_migrations/env.py", line 95, in <module>
    run_migrations_online()
  File "/usr/lib/python2.7/site-packages/sahara/db/migration/alembic_migrations/env.py", line 79, in run_migrations_online
    poolclass=pool.NullPool)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/__init__.py", line 386, in create_engine
    return strategy.create(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 51, in create
    entrypoint = u._get_entrypoint()
AttributeError: 'NoneType' object has no attribute '_get_entrypoint'