How do I update Metabase running on Elastic BeanStalk?

I tried following these instructions to deploy a new version of Metabase to Elastic Beanstalk (http://www.metabase.com/docs/latest/operations-guide/running-metabase-on-elastic-beanstalk.html#deploying-new-versions-of-metabase) and received the following error:

DB is not setup. Make sure to bind call set-default-db-connection! or bind *db-connection*.

I was able to revert to the previous version, however I’m not sure how to proceed. can anyone point me in the right direction?