I got this error when installing active admin on Rails 4

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)

I follow this instruction: http://www.activeadmin.info/docs/documentation.html

Anyone help please.

activeadmin ruby-on-rails-4
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