Open Stack

Hi, 

I'm trying to install Openstack Ocata in 
Ubuntu 16.04.2 LTS. 

During installation of nova at this step 
su -s /bin/sh -c "nova-manage db sync" nova 

I get the following error 

An error has occurred: 
Traceback (most recent call last): 
File "/usr/lib/python2.7/dist-packages/nova/cmd/manage.py", line 1594, in main 
ret = fn(*fn_args, **fn_kwargs) 
File "/usr/lib/python2.7/dist-packages/nova/cmd/manage.py", line 644, in sync 
return migration.db_sync(version) 
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. 


Request the help for solving this issue. 

Thanks, 
S.Gopinath 

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