papertrail "versions" does not exist - ruby-on-rails

Question

Env: Rails 3.2.11
Added paper_trail gem.
Note that I already used that gem and I never had a problem but this time I am getting an error and I can't find out why.
In my Model:
class User < ActiveRecord::Base
has_paper_trail :versions => :paper_trail_versions
...
end
The error:
User Exists (0.6ms) SELECT 1 AS one FROM "users" WHERE ("users"."pseudo" = 'joel' AND "users"."id" != 21) LIMIT 1
PG::Error: ERROR: relation "versions" does not exist
LINE 5: WHERE a.attrelid = '"versions"'::regclass
^
: SELECT a.attname, format_type(a.atttypid, a.atttypmod),
pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"versions"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
(0.1ms) ROLLBACK
Completed 500 Internal Server Error in 28ms
ActiveRecord::StatementInvalid (PG::Error: ERROR: relation "versions" does not exist
LINE 5: WHERE a.attrelid = '"versions"'::regclass
^
: SELECT a.attname, format_type(a.atttypid, a.atttypmod),
pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"versions"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
)
any leads on how to troubleshoot this?

Answer 1

Have you followed the installation instructions:
Install PaperTrail as a gem via your Gemfile:
gem 'paper_trail', '~> 2'
Generate a migration which will add a versions table to your database.
bundle exec rails generate paper_trail:install
Run the migration.
bundle exec rake db:migrate
Add has_paper_trail to the models you want to track.
from https://github.com/airblade/paper_trail