在Rails 4上安装活动管理员时出现此错误
Bundler could not find compatible versions for gem "actionpack":
In Gemfile:
meta_search (>= 1.1.0.pre) ruby depends on
actionpack (~> 3.1.0.alpha) ruby
rails (= 4.0.0.rc1) ruby depends on
actionpack (4.0.0.rc1)
Run Code Online (Sandbox Code Playgroud)
我按照这个指示:http: //www.activeadmin.info/docs/documentation.html
有人请帮忙.