Redmine migration from 1.2 to 2.2.2 error with bitmani

Trying to migrate redmine from 1.2 to 2.2.2 error with bitmani On windows 2008 R2 using bitmani installer When running the command: rake db:migrate RAILS_ENV=production I got the following error:

==  CreateChangesetParents: migrating =========================================
-- create_table(:changeset_parents, {:id=>false})
rake aborted!
An error has occurred, all later migrations canceled:

Mysql2::Error: Table 'changeset_parents' already exists: CREATE TABLE `changeset
_parents` (`changeset_id` int(11) NOT NULL, `parent_id` int(11) NOT NULL) ENGINE
=InnoDB

Tasks: TOP => db:migrate
(See full trace by running task with --trace)

I have removed the file: 20110902000000_create_changeset_parents.rb from migration folder and migration ended successfully.
Redmine seems to work. Is it OK to skip this migration step? Thanks