关于捆绑的capistrano 3 perimission问题

Question

我在使用capistrano 3部署rails 4时突然收到此错误。我在nokogiri没有问题之前部署了。它突然出现了

 Errno::EACCES: Permission denied -
    /home/deploy/xxxxx/shared/bundle/ruby/2.0.0/gems/nokogiri-1.6.0/.autotest
    An error occurred while installing nokogiri (1.6.0), and Bundler cannot
    DEBUG [b3c81f53]    continue.
    DEBUG [b3c81f53]    Make sure that `gem install nokogiri -v '1.6.0'` succeeds before bundling.