我正在尝试更新我的 GITLAB。我一直在关注本文我被这个命令卡住了：
sudo -u gitlab -H bundle exec rake gitlab:enable_namespaces RAILS_ENV=production --trace
输出如下：
rake aborted!
Don't know how to build task 'gitlab:enable_namespaces'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/task_manager.rb:49:in `[]'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:140:in `invoke_task'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:99:in `block (2 levels) in top_level'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:99:in `each'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:99:in `block in top_level'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:108:in `run_with_threads'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:93:in `top_level'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:71:in `block in run'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:158:in `standard_exception_handling'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/lib/rake/application.rb:68:in `run'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.0.1/bin/rake:37:in `<top (required)>'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/bin/rake:23:in `load'
/home/gitlab/gitlab/vendor/bundle/ruby/1.9.1/bin/rake:23:in `<main>'