Question

I have installed active admin on my development machine and it works fine.
But when i run heroku run rake db:migrate it gives me following error

rake aborted! undefined method `setup' for ActiveAdmin:Module

here is my gemfile

source 'https://rubygems.org'

gem 'rails', '3.2.6'

gem 'pg'
gem 'haml'
gem 'haml-rails'
gem 'sorcery'#, "~> 0.7.12"
gem 'jquery-rails'
gem 'localeapp'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem "activeadmin", :git => "git://github.com/gregbell/active_admin.git"
  gem 'sass-rails'#,   '~> 3.2.5'
  gem 'coffee-rails'#, '~> 3.2.2'
  gem 'twitter-bootstrap-rails'
  gem 'uglifier'
end

group :production do
  gem 'thin'
end

Answer 1

  gem "activeadmin", :git => "git://github.com/gregbell/active_admin.git"

Don’t declare active admin under any group.
Atleast it wont work in production environment.