Redmine

I have just tried to upgrade my 2.5 Redmine to 3.0. All works fine but the database migation failed. What is to do?

Edit: Without DB migation I got errors if I try to view a ticket or a user.

Here the Error text:

root@Redmine-System:/usr/share/redmine# bundle exec rake db:migrate RAILS_ENV=production
== 20120930112914 AddJournalsPrivateNotes: migrating ==========================
-- add_column(:journals, :private_notes, :boolean, {:default=>false, :null=>false})
rake aborted!
StandardError: An error has occurred, all later migrations canceled:

Mysql2::Error: Duplicate column name 'private_notes': ALTER TABLE `journals` ADD `private_notes` tinyint(1) DEFAULT 0 NOT NULL/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:299:in `query'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:299:in `block in execute'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/var/lib/gems/1.9.1/gems/activesupport-4.2.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:299:in `execute'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:231:in `execute'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:662:in `block in method_missing'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:632:in `block in say_with_time'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:632:in `say_with_time'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:652:in `method_missing'
/usr/share/redmine/db/migrate/20120930112914_add_journals_private_notes.rb:3:in `up'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:609:in `exec_migration'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:590:in `block (2 levels) in migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:589:in `block in migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:588:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:765:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:1043:in `ddl_transaction'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:956:in `block in migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:952:in `each'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:952:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:820:in `up'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/migration.rb:798:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/var/lib/gems/1.9.1/gems/activerecord-4.2.1/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)