$ RAILS_ENV=production bundle exec rails c There is a version mismatch between the spring client and the server. You should restart the server and make sure to use the same version. CLIENT: 1.3.6, SERVER: 1.3.5
$ spring status Spring is running: 17284 spring server | new_uppers | started 22 hours ago Warning: bad ps syntax, perhaps a bogus ‘-‘? See http://procps.sf.net/faq.html 6291 spring app | new_uppers | started 8 mins ago | development mode
$ spring stop
Spring stopped.
重新启动
$ spring
Version: 1.3.6
There is a version mismatch between the spring client and the server
原文：http://www.cnblogs.com/iwangzheng/p/4705037.html