Error message when running Gitlab

xxx:/home/git/gitlab# sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production
Instance method "lock!" is already defined in ActiveRecord::Base, use generic helper instead or set StateMachine::Machine.ignore_method_conflicts = true.

System information
System:
Current User:   git
Using RVM:      no
Ruby Version:   2.1.2p95
Gem Version:    2.2.2
Bundler Version:1.6.3
Rake Version:   10.3.2
Sidekiq Version:2.17.0

GitLab information
Version:        7.0.0
Revision:       de9bf7d
Directory:      /home/git/gitlab
DB Adapter:     mysql2
URL:            http://xxx
HTTP Clone URL: http://xxx/some-project.git
SSH Clone URL:  git@xxx:some-project.git
Using LDAP:     yes
Using Omniauth: no

GitLab Shell
Version:        1.9.6
Repositories:   /home/git/repositories/
Hooks:          /home/git/gitlab-shell/hooks/
Git:            /usr/bin/git
[WARN] mysql2 failed to invalidate FD safely, leaking some memory

I confirm that I see the same error message on my instance. I also see this message in log/unicorn.stderr.log when machine is restarted. However, I do not see the last warning message in my output.

Instance method "lock!" is already defined in ActiveRecord::Base, use generic helper instead or set StateMachine::Machine.ignore_method_conflicts = true. has been fixed with GitLab 7.1

Status changed to closed