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2018-04-03 11:57:20 -0500 asked a question failed to install ocata nova. NovaException: upgrade DB using Essex release first

I am installing Openstack ocata version - in Ubantu 16.4 following closely the installation guide, but getting the following error.
appreciate if anyone can assist Thanks for your support

/bin/sh -c "nova-manage api_db sync" nova

An error has occurred:

Traceback (most recent call last):

File "/usr/lib/python2.7/dist-packages/nova/cmd/manage.py", line 1617, in main

ret = fn(*fn_args, **fn_kwargs)

File "/usr/lib/python2.7/dist-packages/nova/cmd/manage.py", line 820, in sync

return migration.db_sync(version, database='api')

File "/usr/lib/python2.7/dist-packages/nova/db/migration.py", line 26, in db_sync

return IMPL.db_sync(version=version, database=database, context=context)

File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/migration.py", line 53, in db_sync

current_version = db_version(database, context=context)

File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/migration.py", line 84, in db_version

_("Upgrade DB using Essex release first."))

NovaException: Upgrade DB using Essex release first.