Issue with conflict in Gemfile when using spree_active_sale and spree 2-2-stable

Question

I added spree_active_sale but got error in

Bundler could not find compatible versions for gem "spree_core":
In Gemfile:
spree_active_sale (~> 2.0.0) ruby depends on
spree_core (~> 2.0.0) ruby spree (>= 0) ruby depends on
spree_core (2.2.2.beta)

My gem file

gem 'rails', '4.0.4'
gem 'sqlite3'
gem 'spree', github: 'spree/spree', branch: '2-2-stable'
gem 'spree_auth_devise', github: 'spree/spree_auth_devise', branch: '2-2-stable'
gem 'spree_active_sale' , :git => 'git://github.com/suryart/spree_active_sale.git', :branch => '2-0-stable'

Answer 1

spree_active_sale's gemspec says it needs spree '~> 2.0.0'. Unless they update, or you fix it, you're stuck.

If your project allows it, it seems like you could downgrade spree to 2.0 as well.