For what it's worth, I'm upgrading from 1.5.1 to 1.6.3 right now and I just
encountered the same error. I'm on Ubuntu 11.10, PostgreSQL 9.1, Python 2.7.
$ rb-site upgrade review-www
Rebuilding directory structure
Upgrading site settings_local.py
Updating database. This may take a while.
DeprecationWarning: settings.DATABASE_* is deprecated; use
DeprecationWarning: Short names for ENGINE in database configurations are
deprecated. Prepend default.ENGINE with 'django.db.backends.'
Creating tables ...
Creating table accounts_localsiteprofile
Creating table attachments_fileattachment
Creating table reviews_fileattachmentcomment
Creating table site_localsite_users
Creating table site_localsite_admins
Creating table site_localsite
Upgrading Review Board from 1.5.1 to 1.6.3
There are unapplied evolutions for sessions.
There are unapplied evolutions for accounts.
There are unapplied evolutions for diffviewer.
There are unapplied evolutions for reviews.
There are unapplied evolutions for scmtools.
Adding baseline version for new models
Project signature has changed - an evolution is required
Installing custom SQL ...
Installing indexes ...
No fixtures found.
Registering new SCM Tool Plastic SCM
(reviewboard.scmtools.plastic.PlasticTool) in database
Error: Error applying evolution: column "basedir" of relation
"diffviewer_diffset" already exists
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