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Getting Nova exception: "Upgrade DB using Essex release first"

 Hello folks,

I am trying to install Openstack Ocata on Ubuntu 16.04.2 LTS server and during installation of nova, i am getting the below exception after running the following command: - su -s /bin/sh -c "nova-manage api_db sync" nova

Getting the following error: - An error has occurred: Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/nova/cmd/", line 1594, in main ret = fn(fn_args, *fn_kwargs) File "/usr/lib/python2.7/dist-packages/nova/cmd/", line 644, in sync return migration.db_sync(version) File "/usr/lib/python2.7/dist-packages/nova/db/", 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/", line 53, in db_sync current_version = db_version(database, context=context) File "/usr/lib/python2.7/dist-packages/nova/db/sqlalchemy/", line 84, in db_version _("Upgrade DB using Essex release first.")) NovaException: Upgrade DB using Essex release first.

Request the help for solving this issue. Please co-operate with your inputs if you know about this issue.

Thanks & Regards, 
Ruchir Nerurkar