I was receiving the following error message after precompiling my assets locally and then pushing the code to Heroku: 

2012-03-28T17:06:01+00:00 app[web.1]: Started GET "/admin/login" for 67.163.67.203 at 2012-03-28 17:06:01 +0000

2012-03-28T17:06:01+00:00 app[web.1]: 

2012-03-28T17:06:01+00:00 app[web.1]: ActionView::Template::Error (File to import not found or unreadable: active_admin/mixins.

2012-03-28T17:06:01+00:00 app[web.1]: Load paths:
2012-03-28T17:06:01+00:00 app[web.1]:   /app
2012-03-28T17:06:01+00:00 app[web.1]:   /app/vendor/bundle/ruby/1.9.1/gems/activeadmin-0.4.3/app/assets/stylesheets
2012-03-28T17:06:01+00:00 app[web.1]:   (in /app/vendor/assets/stylesheets/active_admin.css.scss)):
2012-03-28T17:06:01+00:00 app[web.1]:     7: 
2012-03-28T17:06:01+00:00 app[web.1]:     6:   <title><%= [@page_title, active_admin_application.site_title].compact.join(" | ") %></title>
2012-03-28T17:06:01+00:00 app[web.1]:     8:   <% ActiveAdmin.application.stylesheets.each do |style| %>
2012-03-28T17:06:01+00:00 app[web.1]:     9:     <%= stylesheet_link_tag style.path, style.options %>
2012-03-28T17:06:01+00:00 app[web.1]:     10:   <% end %>
2012-03-28T17:06:01+00:00 app[web.1]:     11:   <% ActiveAdmin.application.javascripts.each do |path| %>
2012-03-28T17:06:01+00:00 app[web.1]:     12:     <%= javascript_include_tag path %>
2012-03-28T17:06:01+00:00 app[web.1]:   vendor/assets/stylesheets/active_admin.css.scss:2

...

I tried a bunch of different options including the following tip that I found here - http://mrdanadams.com/2011/exclude-active-admin-js-css-rails/ and others on the GitHub page.

None of those options worked. Ultimately, I received some advice to delete my public/assets directory from git, push the code to Heroku and let Heroku precompile the

ruby-on-rails-3 heroku activeadmin
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