all'     from /Library/Ruby/Gems/0.0.0/gems/capybara-0.0.0/lib/capybara/node/base.rb:00:in `synchronize'     from /Library/Ruby/Gems/0.0.0/gems/capybara-0.0.0/lib/capybara/node/finders.rb:000:in `all'     from /Library/Ruby/Gems/0.0.0/gems/capybara-0.0.0/lib/capybara/se